664788700642 has 32 divisors (see below), whose sum is σ = 1125757336320. Its totient is φ = 291650580480.

The previous prime is 664788700553. The next prime is 664788700669. The reversal of 664788700642 is 246007887466.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1577058 + ... + 1953634.

It is an arithmetic number, because the mean of its divisors is an integer number (35179916760).

Almost surely, 2^664788700642 is an apocalyptic number.

664788700642 is a deficient number, since it is larger than the sum of its proper divisors (460968635678).

664788700642 is a wasteful number, since it uses less digits than its factorization.

664788700642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379386.

The product of its (nonzero) digits is 21676032, while the sum is 58.

The spelling of 664788700642 in words is "six hundred sixty-four billion, seven hundred eighty-eight million, seven hundred thousand, six hundred forty-two".