666685582608 has 20 divisors (see below), whose sum is σ = 1722271088528. Its totient is φ = 222228527520.

The previous prime is 666685582603. The next prime is 666685582613. The reversal of 666685582608 is 806285586666.

It is an interprime number because it is at equal distance from previous prime (666685582603) and next prime (666685582613).

It is not an unprimeable number, because it can be changed into a prime (666685582601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6944641438 + ... + 6944641533.

Almost surely, 2^666685582608 is an apocalyptic number.

It is an amenable number.

666685582608 is an abundant number, since it is smaller than the sum of its proper divisors (1055585505920).

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

666685582608 is a wasteful number, since it uses less digits than its factorization.

666685582608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13889282982 (or 13889282976 counting only the distinct ones).

The product of its (nonzero) digits is 199065600, while the sum is 66.

The spelling of 666685582608 in words is "six hundred sixty-six billion, six hundred eighty-five million, five hundred eighty-two thousand, six hundred eight".