51656880004 has 48 divisors (see below), whose sum is σ = 93583854000. Its totient is φ = 24930533376.

The previous prime is 51656879929. The next prime is 51656880007. The reversal of 51656880004 is 40008865615.

It can be written as a sum of positive squares in 8 ways, for example, as 3740545600 + 47916334404 = 61160^2 + 218898^2 .

It is not an unprimeable number, because it can be changed into a prime (51656880007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11109072 + ... + 11113720.

It is an arithmetic number, because the mean of its divisors is an integer number (1949663625).

Almost surely, 2^51656880004 is an apocalyptic number.

It is an amenable number.

51656880004 is a deficient number, since it is larger than the sum of its proper divisors (41926973996).

51656880004 is a wasteful number, since it uses less digits than its factorization.

51656880004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272 (or 5270 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The spelling of 51656880004 in words is "fifty-one billion, six hundred fifty-six million, eight hundred eighty thousand, four".