51665981360 has 80 divisors (see below), whose sum is σ = 141712453632. Its totient is φ = 17142624000.

The previous prime is 51665981359. The next prime is 51665981383. The reversal of 51665981360 is 6318956615.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 51665981299 and 51665981308.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1470716 + ... + 1505435.

Almost surely, 2^51665981360 is an apocalyptic number.

It is an amenable number.

51665981360 is an abundant number, since it is smaller than the sum of its proper divisors (90046472272).

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

51665981360 is a wasteful number, since it uses less digits than its factorization.

51665981360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976202 (or 2976196 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 51665981360 in words is "fifty-one billion, six hundred sixty-five million, nine hundred eighty-one thousand, three hundred sixty".