51512515220 has 24 divisors (see below), whose sum is σ = 108182667264. Its totient is φ = 20603789856.

The previous prime is 51512515213. The next prime is 51512515231. The reversal of 51512515220 is 2251521515.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322157 + ... + 454763.

It is an arithmetic number, because the mean of its divisors is an integer number (4507611136).

Almost surely, 2^51512515220 is an apocalyptic number.

It is an amenable number.

51512515220 is an abundant number, since it is smaller than the sum of its proper divisors (56670152044).

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

51512515220 is a wasteful number, since it uses less digits than its factorization.

51512515220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152039 (or 152037 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 51512515220 in words is "fifty-one billion, five hundred twelve million, five hundred fifteen thousand, two hundred twenty".