665930172018 has 32 divisors (see below), whose sum is σ = 1407288960000. Its totient is φ = 209494133136.

The previous prime is 665930172013. The next prime is 665930172059. The reversal of 665930172018 is 810271039566.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (665930172013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11075518 + ... + 11135481.

It is an arithmetic number, because the mean of its divisors is an integer number (43977780000).

Almost surely, 2^665930172018 is an apocalyptic number.

665930172018 is an abundant number, since it is smaller than the sum of its proper divisors (741358787982).

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

665930172018 is a wasteful number, since it uses less digits than its factorization.

665930172018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22211286.

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 665930172018 in words is "six hundred sixty-five billion, nine hundred thirty million, one hundred seventy-two thousand, eighteen".