51220029320 has 16 divisors (see below), whose sum is σ = 115245066060. Its totient is φ = 20488011712.

The previous prime is 51220029319. The next prime is 51220029347. The reversal of 51220029320 is 2392002215.

It can be written as a sum of positive squares in 2 ways, for example, as 47762354116 + 3457675204 = 218546^2 + 58802^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51220029320.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640250327 + ... + 640250406.

Almost surely, 2^51220029320 is an apocalyptic number.

It is an amenable number.

51220029320 is an abundant number, since it is smaller than the sum of its proper divisors (64025036740).

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

51220029320 is a wasteful number, since it uses less digits than its factorization.

51220029320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280500744 (or 1280500740 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The spelling of 51220029320 in words is "fifty-one billion, two hundred twenty million, twenty-nine thousand, three hundred twenty".