51600561660 has 36 divisors (see below), whose sum is σ = 156521704248. Its totient is φ = 13760149728.

The previous prime is 51600561643. The next prime is 51600561671. The reversal of 51600561660 is 6616500615.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143334714 + ... + 143335073.

It is an arithmetic number, because the mean of its divisors is an integer number (4347825118).

Almost surely, 2^51600561660 is an apocalyptic number.

It is an amenable number.

51600561660 is an abundant number, since it is smaller than the sum of its proper divisors (104921142588).

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

51600561660 is a wasteful number, since it uses less digits than its factorization.

51600561660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286669802 (or 286669797 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 51600561660 in words is "fifty-one billion, six hundred million, five hundred sixty-one thousand, six hundred sixty".