51256156404 has 24 divisors (see below), whose sum is σ = 119601443808. Its totient is φ = 17084850400.

The previous prime is 51256156387. The next prime is 51256156421. The reversal of 51256156404 is 40465165215.

It is an interprime number because it is at equal distance from previous prime (51256156387) and next prime (51256156421).

It is a super-2 number, since 2×51256156404² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591454 + ... + 672554.

It is an arithmetic number, because the mean of its divisors is an integer number (4983393492).

Almost surely, 2^51256156404 is an apocalyptic number.

It is an amenable number.

51256156404 is an abundant number, since it is smaller than the sum of its proper divisors (68345287404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51256156404 is a wasteful number, since it uses less digits than its factorization.

51256156404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133775 (or 133773 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 51256156404 in words is "fifty-one billion, two hundred fifty-six million, one hundred fifty-six thousand, four hundred four".