256502990474 has 32 divisors (see below), whose sum is σ = 401068875600. Its totient is φ = 122881722880.

The previous prime is 256502990473. The next prime is 256502990479. The reversal of 256502990474 is 474099205652.

It can be written as a sum of positive squares in 8 ways, for example, as 106971514225 + 149531476249 = 327065^2 + 386693^2 .

It is not an unprimeable number, because it can be changed into a prime (256502990473) 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, 41228684 + ... + 41234904.

Almost surely, 2^256502990474 is an apocalyptic number.

256502990474 is a deficient number, since it is larger than the sum of its proper divisors (144565885126).

256502990474 is a wasteful number, since it uses less digits than its factorization.

256502990474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11578.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 256502990474 in words is "two hundred fifty-six billion, five hundred two million, nine hundred ninety thousand, four hundred seventy-four".