51977581320 has 128 divisors (see below), whose sum is σ = 185957130240. Its totient is φ = 11364038400.

The previous prime is 51977581289. The next prime is 51977581333. The reversal of 51977581320 is 2318577915.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 51977581320.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1325856 + ... + 1364495.

It is an arithmetic number, because the mean of its divisors is an integer number (1452790080).

Almost surely, 2^51977581320 is an apocalyptic number.

It is an amenable number.

51977581320 is an abundant number, since it is smaller than the sum of its proper divisors (133979548920).

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

51977581320 is a wasteful number, since it uses less digits than its factorization.

51977581320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2690395 (or 2690391 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 48.

The spelling of 51977581320 in words is "fifty-one billion, nine hundred seventy-seven million, five hundred eighty-one thousand, three hundred twenty".