666662888660 has 48 divisors (see below), whose sum is σ = 1443935566080. Its totient is φ = 258407318400.

The previous prime is 666662888597. The next prime is 666662888681. The reversal of 666662888660 is 66888266666.

It is a congruent number.

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, 3416030 + ... + 3605909.

It is an arithmetic number, because the mean of its divisors is an integer number (30081990960).

Almost surely, 2^666662888660 is an apocalyptic number.

It is an amenable number.

666662888660 is an abundant number, since it is smaller than the sum of its proper divisors (777272677420).

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

666662888660 is a wasteful number, since it uses less digits than its factorization.

666662888660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7022096 (or 7022094 counting only the distinct ones).

The product of its (nonzero) digits is 286654464, while the sum is 68.

The spelling of 666662888660 in words is "six hundred sixty-six billion, six hundred sixty-two million, eight hundred eighty-eight thousand, six hundred sixty".