66657518032 has 20 divisors (see below), whose sum is σ = 147598790176. Its totient is φ = 28567507680.

The previous prime is 66657518021. The next prime is 66657518047. The reversal of 66657518032 is 23081575666.

It is a congruent number.

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, 297578094 + ... + 297578317.

Almost surely, 2^66657518032 is an apocalyptic number.

It is an amenable number.

66657518032 is an abundant number, since it is smaller than the sum of its proper divisors (80941272144).

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

66657518032 is a wasteful number, since it uses less digits than its factorization.

66657518032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595156426 (or 595156420 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 66657518032 in words is "sixty-six billion, six hundred fifty-seven million, five hundred eighteen thousand, thirty-two".