666157801026 has 16 divisors (see below), whose sum is σ = 1337890147200. Its totient is φ = 221123509488.

The previous prime is 666157801009. The next prime is 666157801039. The reversal of 666157801026 is 620108751666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232271161 + ... + 232274028.

It is an arithmetic number, because the mean of its divisors is an integer number (83618134200).

Almost surely, 2^666157801026 is an apocalyptic number.

666157801026 is an abundant number, since it is smaller than the sum of its proper divisors (671732346174).

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

666157801026 is a wasteful number, since it uses less digits than its factorization.

666157801026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464545433.

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 666157801026 in words is "six hundred sixty-six billion, one hundred fifty-seven million, eight hundred one thousand, twenty-six".