255316973521 has 9 divisors (see below), whose sum is σ = 256122407433. Its totient is φ = 254514069300.

The previous prime is 255316973519. The next prime is 255316973539. The reversal of 255316973521 is 125379613552.

The square root of 255316973521 is 505289.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 255316973521 - 2¹ = 255316973519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255316973221) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 221821296 + ... + 221822446.

Almost surely, 2^255316973521 is an apocalyptic number.

255316973521 is the 505289-th square number.

255316973521 is the 252645-th centered octagonal number.

It is an amenable number.

255316973521 is a deficient number, since it is larger than the sum of its proper divisors (805433912).

255316973521 is an frugal number, since it uses more digits than its factorization.

255316973521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3180 (or 1590 counting only the distinct ones).

The product of its digits is 1701000, while the sum is 49.

Multiplying 255316973521 by its sum of digits (49), we get a square (12510531702529 = 3537023²).

The spelling of 255316973521 in words is "two hundred fifty-five billion, three hundred sixteen million, nine hundred seventy-three thousand, five hundred twenty-one".