666617666112 has 84 divisors (see below), whose sum is σ = 1929657556476. Its totient is φ = 220005811200.

The previous prime is 666617666021. The next prime is 666617666129. The reversal of 666617666112 is 211666716666.

It can be written as a sum of positive squares in 2 ways, for example, as 398898349056 + 267719317056 = 631584^2 + 517416^2 .

It is a super-2 number, since 2×666617666112² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5671143 + ... + 5787494.

Almost surely, 2^666617666112 is an apocalyptic number.

It is an amenable number.

666617666112 is an abundant number, since it is smaller than the sum of its proper divisors (1263039890364).

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

666617666112 is a wasteful number, since it uses less digits than its factorization.

666617666112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11458756 (or 11458743 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 666617666112 in words is "six hundred sixty-six billion, six hundred seventeen million, six hundred sixty-six thousand, one hundred twelve".