51206615660 has 48 divisors (see below), whose sum is σ = 110081099520. Its totient is φ = 20002065600.

The previous prime is 51206615657. The next prime is 51206615687. The reversal of 51206615660 is 6651660215.

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, 34487 + ... + 321873.

It is an arithmetic number, because the mean of its divisors is an integer number (2293356240).

Almost surely, 2^51206615660 is an apocalyptic number.

It is an amenable number.

51206615660 is an abundant number, since it is smaller than the sum of its proper divisors (58874483860).

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

51206615660 is a wasteful number, since it uses less digits than its factorization.

51206615660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287606 (or 287604 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 51206615660 in words is "fifty-one billion, two hundred six million, six hundred fifteen thousand, six hundred sixty".