666335431824 has 80 divisors (see below), whose sum is σ = 1885472536320. Its totient is φ = 201837905920.

The previous prime is 666335431787. The next prime is 666335431831. The reversal of 666335431824 is 428134533666.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 14055432 + ... + 14102759.

It is an arithmetic number, because the mean of its divisors is an integer number (23568406704).

Almost surely, 2^666335431824 is an apocalyptic number.

It is an amenable number.

666335431824 is an abundant number, since it is smaller than the sum of its proper divisors (1219137104496).

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

666335431824 is a wasteful number, since it uses less digits than its factorization.

666335431824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28158248 (or 28158242 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 51.

The spelling of 666335431824 in words is "six hundred sixty-six billion, three hundred thirty-five million, four hundred thirty-one thousand, eight hundred twenty-four".