666436161264 has 40 divisors (see below), whose sum is σ = 1722783164880. Its totient is φ = 221996172288.

The previous prime is 666436161257. The next prime is 666436161299. The reversal of 666436161264 is 462161634666.

It is a happy number.

666436161264 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 4590747 + ... + 4733690.

It is an arithmetic number, because the mean of its divisors is an integer number (43069579122).

Almost surely, 2^666436161264 is an apocalyptic number.

It is an amenable number.

666436161264 is an abundant number, since it is smaller than the sum of its proper divisors (1056347003616).

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

666436161264 is a wasteful number, since it uses less digits than its factorization.

666436161264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9325937 (or 9325931 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 51.

The spelling of 666436161264 in words is "six hundred sixty-six billion, four hundred thirty-six million, one hundred sixty-one thousand, two hundred sixty-four".