665231167944 has 48 divisors (see below), whose sum is σ = 2059048854720. Its totient is φ = 190066047840.

The previous prime is 665231167943. The next prime is 665231167949. The reversal of 665231167944 is 449761132566.

It is a happy number.

665231167944 is a `hidden beast` number, since 6 + 6 + 523 + 1 + 1 + 6 + 79 + 44 = 666.

It is not an unprimeable number, because it can be changed into a prime (665231167943) 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 11 ways as a sum of consecutive naturals, for example, 659951052 + ... + 659952059.

It is an arithmetic number, because the mean of its divisors is an integer number (42896851140).

Almost surely, 2^665231167944 is an apocalyptic number.

It is an amenable number.

665231167944 is an abundant number, since it is smaller than the sum of its proper divisors (1393817686776).

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

665231167944 is a wasteful number, since it uses less digits than its factorization.

665231167944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319903130 (or 1319903123 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The spelling of 665231167944 in words is "six hundred sixty-five billion, two hundred thirty-one million, one hundred sixty-seven thousand, nine hundred forty-four".