66651251172 has 48 divisors (see below), whose sum is σ = 178587091200. Its totient is φ = 19134329760.

The previous prime is 66651251167. The next prime is 66651251213. The reversal of 66651251172 is 27115215666.

66651251172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 13285222 + ... + 13290237.

It is an arithmetic number, because the mean of its divisors is an integer number (3720564400).

Almost surely, 2^66651251172 is an apocalyptic number.

It is an amenable number.

66651251172 is an abundant number, since it is smaller than the sum of its proper divisors (111935840028).

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

66651251172 is a wasteful number, since it uses less digits than its factorization.

66651251172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26575496 (or 26575494 counting only the distinct ones).

The product of its digits is 151200, while the sum is 42.

The spelling of 66651251172 in words is "sixty-six billion, six hundred fifty-one million, two hundred fifty-one thousand, one hundred seventy-two".