256157858792128 has 56 divisors (see below), whose sum is σ = 510898964148720. Its totient is φ = 127428710323200.

The previous prime is 256157858792123. The next prime is 256157858792153. The reversal of 256157858792128 is 821297858751652.

It is a happy number.

It is a super-2 number, since 2×256157858792128² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256157858792123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2469903 + ... + 22768753.

It is an arithmetic number, because the mean of its divisors is an integer number (9123195788370).

Almost surely, 2^{256157858792128} is an apocalyptic number.

It is an amenable number.

256157858792128 is a deficient number, since it is larger than the sum of its proper divisors (254741105356592).

256157858792128 is a wasteful number, since it uses less digits than its factorization.

256157858792128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20299865 (or 20299855 counting only the distinct ones).

The product of its digits is 1354752000, while the sum is 76.

The spelling of 256157858792128 in words is "two hundred fifty-six trillion, one hundred fifty-seven billion, eight hundred fifty-eight million, seven hundred ninety-two thousand, one hundred twenty-eight".