666630420061564 has 18 divisors (see below), whose sum is σ = 1357069069411440. Its totient is φ = 285698751454872.

The previous prime is 666630420061549. The next prime is 666630420061583. The reversal of 666630420061564 is 465160024036666.

It is a super-2 number, since 2×666630420061564² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1700587806084 + ... + 1700587806475.

Almost surely, 2^{666630420061564} is an apocalyptic number.

It is an amenable number.

666630420061564 is an abundant number, since it is smaller than the sum of its proper divisors (690438649349876).

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

666630420061564 is a wasteful number, since it uses less digits than its factorization.

666630420061564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3401175612577 (or 3401175612568 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 55.

The spelling of 666630420061564 in words is "six hundred sixty-six trillion, six hundred thirty billion, four hundred twenty million, sixty-one thousand, five hundred sixty-four".