51630894564 has 12 divisors (see below), whose sum is σ = 120472087344. Its totient is φ = 17210298184.

The previous prime is 51630894509. The next prime is 51630894587. The reversal of 51630894564 is 46549803615.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2151287262 + ... + 2151287285.

It is an arithmetic number, because the mean of its divisors is an integer number (10039340612).

Almost surely, 2^51630894564 is an apocalyptic number.

It is an amenable number.

51630894564 is an abundant number, since it is smaller than the sum of its proper divisors (68841192780).

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

51630894564 is a wasteful number, since it uses less digits than its factorization.

51630894564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4302574554 (or 4302574552 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 51630894564 in words is "fifty-one billion, six hundred thirty million, eight hundred ninety-four thousand, five hundred sixty-four".