755

755 is a natural number that comes after 754 and before 756. It is an odd, composite number.

In mathematics, 755 factors as 5 × 151, so its divisors are 1, 5, 151, and 755. It is a semiprime, being the product of two primes. In different numeral systems, 755 is written as DCCLV in Roman numerals, 1011110011 in binary, and 0x2F3 in hexadecimal.

Historically, the year 755 CE is notable for the start of the An Lushan Rebellion during the Tang dynasty in China, a large-scale uprising that significantly weakened the dynasty and influenced its subsequent trajectory.

In computing, 755 is a common file permission setting in Unix-like systems. As an octal permission, 755 corresponds to rwxr-xr-x: the owner has read, write, and execute permissions, while the group and others have read and execute permissions.

Beyond mathematics and computing, 755 frequently appears as a numeric identifier in catalogs, product model numbers, or route designations.