256507724562418 has 12 divisors (see below), whose sum is σ = 447579805103982. Its totient is φ = 109931881955280.

The previous prime is 256507724562373. The next prime is 256507724562443. The reversal of 256507724562418 is 814265427705652.

It can be written as a sum of positive squares in only one way, i.e., 251718310490689 + 4789414071729 = 15865633^2 + 2188473^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256507724562418.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1308712880323 + ... + 1308712880518.

Almost surely, 2^{256507724562418} is an apocalyptic number.

256507724562418 is a deficient number, since it is larger than the sum of its proper divisors (191072080541564).

256507724562418 is a wasteful number, since it uses less digits than its factorization.

256507724562418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617425760857 (or 2617425760850 counting only the distinct ones).

The product of its (nonzero) digits is 225792000, while the sum is 64.

The spelling of 256507724562418 in words is "two hundred fifty-six trillion, five hundred seven billion, seven hundred twenty-four million, five hundred sixty-two thousand, four hundred eighteen".