51656955402 has 24 divisors (see below), whose sum is σ = 111872461824. Its totient is φ = 15894447504.

The previous prime is 51656955401. The next prime is 51656955421. The reversal of 51656955402 is 20455965615.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (51656955401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25470858 + ... + 25472885.

It is an arithmetic number, because the mean of its divisors is an integer number (4661352576).

Almost surely, 2^51656955402 is an apocalyptic number.

51656955402 is an abundant number, since it is smaller than the sum of its proper divisors (60215506422).

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

51656955402 is a wasteful number, since it uses less digits than its factorization.

51656955402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50943774 (or 50943761 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 48.

The spelling of 51656955402 in words is "fifty-one billion, six hundred fifty-six million, nine hundred fifty-five thousand, four hundred two".