51616565004 has 96 divisors (see below), whose sum is σ = 131268444160. Its totient is φ = 15725793600.

The previous prime is 51616564843. The next prime is 51616565041. The reversal of 51616565004 is 40056561615.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2328477 + ... + 2350539.

Almost surely, 2^51616565004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51616565004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65634222080).

51616565004 is an abundant number, since it is smaller than the sum of its proper divisors (79651879156).

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

51616565004 is a wasteful number, since it uses less digits than its factorization.

51616565004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22451 (or 22449 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 51616565004 in words is "fifty-one billion, six hundred sixteen million, five hundred sixty-five thousand, four".