51256156401 has 16 divisors (see below), whose sum is σ = 78553497600. Its totient is φ = 32992467984.

The previous prime is 51256156387. The next prime is 51256156421. The reversal of 51256156401 is 10465165215.

51256156401 is a `hidden beast` number, since 5 + 1 + 2 + 5 + 6 + 1 + 5 + 640 + 1 = 666.

It is not a de Polignac number, because 51256156401 - 2²³ = 51247767793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51256156421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32729841 + ... + 32731406.

It is an arithmetic number, because the mean of its divisors is an integer number (4909593600).

Almost surely, 2^51256156401 is an apocalyptic number.

It is an amenable number.

51256156401 is a deficient number, since it is larger than the sum of its proper divisors (27297341199).

51256156401 is a wasteful number, since it uses less digits than its factorization.

51256156401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65461285 (or 65461279 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 51256156401 in words is "fifty-one billion, two hundred fifty-six million, one hundred fifty-six thousand, four hundred one".