666594618696 has 48 divisors (see below), whose sum is σ = 1863597864960. Its totient is φ = 215030521440.

The previous prime is 666594618691. The next prime is 666594618769. The reversal of 666594618696 is 696816495666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (666594618691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149324520 + ... + 149328983.

It is an arithmetic number, because the mean of its divisors is an integer number (38824955520).

Almost surely, 2^666594618696 is an apocalyptic number.

It is an amenable number.

666594618696 is an abundant number, since it is smaller than the sum of its proper divisors (1197003246264).

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

666594618696 is a wasteful number, since it uses less digits than its factorization.

666594618696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298653546 (or 298653539 counting only the distinct ones).

The product of its digits is 604661760, while the sum is 72.

The spelling of 666594618696 in words is "six hundred sixty-six billion, five hundred ninety-four million, six hundred eighteen thousand, six hundred ninety-six".