666591653204 has 24 divisors (see below), whose sum is σ = 1232436522240. Its totient is φ = 314955994976.

The previous prime is 666591653191. The next prime is 666591653243. The reversal of 666591653204 is 402356195666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61127312 + ... + 61138215.

It is an arithmetic number, because the mean of its divisors is an integer number (51351521760).

Almost surely, 2^666591653204 is an apocalyptic number.

It is an amenable number.

666591653204 is a deficient number, since it is larger than the sum of its proper divisors (565844869036).

666591653204 is a wasteful number, since it uses less digits than its factorization.

666591653204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122265607 (or 122265605 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 666591653204 in words is "six hundred sixty-six billion, five hundred ninety-one million, six hundred fifty-three thousand, two hundred four".