256758193172 has 12 divisors (see below), whose sum is σ = 483890441076. Its totient is φ = 118503781440.

The previous prime is 256758193163. The next prime is 256758193177. The reversal of 256758193172 is 271391857652.

It can be written as a sum of positive squares in 2 ways, for example, as 131771904016 + 124986289156 = 363004^2 + 353534^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256758193177) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2468828729 + ... + 2468828832.

It is an arithmetic number, because the mean of its divisors is an integer number (40324203423).

Almost surely, 2^256758193172 is an apocalyptic number.

It is an amenable number.

256758193172 is a deficient number, since it is larger than the sum of its proper divisors (227132247904).

256758193172 is a wasteful number, since it uses less digits than its factorization.

256758193172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4937657578 (or 4937657576 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 56.

The spelling of 256758193172 in words is "two hundred fifty-six billion, seven hundred fifty-eight million, one hundred ninety-three thousand, one hundred seventy-two".