256620735411572 has 48 divisors (see below), whose sum is σ = 535636583553792. Its totient is φ = 105182795773440.

The previous prime is 256620735411553. The next prime is 256620735411587. The reversal of 256620735411572 is 275114537026652.

It is a super-2 number, since 2×256620735411572² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25560179 + ... + 34155002.

It is an arithmetic number, because the mean of its divisors is an integer number (11159095490704).

Almost surely, 2^{256620735411572} is an apocalyptic number.

It is an amenable number.

256620735411572 is an abundant number, since it is smaller than the sum of its proper divisors (279015848142220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256620735411572 is a wasteful number, since it uses less digits than its factorization.

256620735411572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59721888 (or 59721886 counting only the distinct ones).

The product of its (nonzero) digits is 21168000, while the sum is 56.

The spelling of 256620735411572 in words is "two hundred fifty-six trillion, six hundred twenty billion, seven hundred thirty-five million, four hundred eleven thousand, five hundred seventy-two".