256923698658 has 64 divisors (see below), whose sum is σ = 563194736640. Its totient is φ = 77490691200.

The previous prime is 256923698641. The next prime is 256923698663. The reversal of 256923698658 is 856896329652.

It is a junction number, because it is equal to n+sod(n) for n = 256923698592 and 256923698601.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12609483 + ... + 12629841.

It is an arithmetic number, because the mean of its divisors is an integer number (8799917760).

Almost surely, 2^256923698658 is an apocalyptic number.

256923698658 is an abundant number, since it is smaller than the sum of its proper divisors (306271037982).

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

256923698658 is a wasteful number, since it uses less digits than its factorization.

256923698658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21263.

The product of its digits is 335923200, while the sum is 69.

The spelling of 256923698658 in words is "two hundred fifty-six billion, nine hundred twenty-three million, six hundred ninety-eight thousand, six hundred fifty-eight".