256724817458 has 6 divisors (see below), whose sum is σ = 385088301021. Its totient is φ = 128362050452.

The previous prime is 256724817457. The next prime is 256724817509. The reversal of 256724817458 is 854718427652.

It can be written as a sum of positive squares in 2 ways, for example, as 255972247969 + 752569489 = 505937^2 + 27433^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=358277.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256724817397 and 256724817406.

It is not an unprimeable number, because it can be changed into a prime (256724817451) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 537416 + ... + 895692.

Almost surely, 2^256724817458 is an apocalyptic number.

256724817458 is a deficient number, since it is larger than the sum of its proper divisors (128363483563).

256724817458 is an frugal number, since it uses more digits than its factorization.

256724817458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716556 (or 358279 counting only the distinct ones).

The product of its digits is 30105600, while the sum is 59.

The spelling of 256724817458 in words is "two hundred fifty-six billion, seven hundred twenty-four million, eight hundred seventeen thousand, four hundred fifty-eight".