256512172724 has 6 divisors (see below), whose sum is σ = 448896302274. Its totient is φ = 128256086360.

The previous prime is 256512172717. The next prime is 256512172739. The reversal of 256512172724 is 427271215652.

256512172724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 255368515600 + 1143657124 = 505340^2 + 33818^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32064021587 + ... + 32064021594.

It is an arithmetic number, because the mean of its divisors is an integer number (74816050379).

Almost surely, 2^256512172724 is an apocalyptic number.

It is an amenable number.

256512172724 is a deficient number, since it is larger than the sum of its proper divisors (192384129550).

256512172724 is a wasteful number, since it uses less digits than its factorization.

256512172724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64128043185 (or 64128043183 counting only the distinct ones).

The product of its digits is 470400, while the sum is 44.

The spelling of 256512172724 in words is "two hundred fifty-six billion, five hundred twelve million, one hundred seventy-two thousand, seven hundred twenty-four".