256621653013132 has 48 divisors (see below), whose sum is σ = 511886444880384. Its totient is φ = 111428015600000.

The previous prime is 256621653013069. The next prime is 256621653013139. The reversal of 256621653013132 is 231310356126652.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (256621653013139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165838744 + ... + 167379007.

It is an arithmetic number, because the mean of its divisors is an integer number (10664300935008).

Almost surely, 2^{256621653013132} is an apocalyptic number.

256621653013132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256621653013132 is a deficient number, since it is larger than the sum of its proper divisors (255264791867252).

256621653013132 is a wasteful number, since it uses less digits than its factorization.

256621653013132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333218550 (or 333218548 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 256621653013132 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, six hundred fifty-three million, thirteen thousand, one hundred thirty-two".