666655515512 has 16 divisors (see below), whose sum is σ = 1428547533360. Its totient is φ = 285709506624.

The previous prime is 666655515511. The next prime is 666655515527. The reversal of 666655515512 is 215515556666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666655515511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5952281333 + ... + 5952281444.

It is an arithmetic number, because the mean of its divisors is an integer number (89284220835).

Almost surely, 2^666655515512 is an apocalyptic number.

It is an amenable number.

666655515512 is an abundant number, since it is smaller than the sum of its proper divisors (761892017848).

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

666655515512 is a wasteful number, since it uses less digits than its factorization.

666655515512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11904562790 (or 11904562786 counting only the distinct ones).

The product of its digits is 8100000, while the sum is 53.

The spelling of 666655515512 in words is "six hundred sixty-six billion, six hundred fifty-five million, five hundred fifteen thousand, five hundred twelve".