664723607236 has 24 divisors (see below), whose sum is σ = 1252770499904. Its totient is φ = 306790083360.

The previous prime is 664723607201. The next prime is 664723607291. The reversal of 664723607236 is 632706327466.

It is a Harshad number since it is a multiple of its sum of digits (52).

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 7 ways as a sum of consecutive naturals, for example, 5728651 + ... + 5843533.

Almost surely, 2^664723607236 is an apocalyptic number.

It is an amenable number.

664723607236 is a deficient number, since it is larger than the sum of its proper divisors (588046892668).

664723607236 is a wasteful number, since it uses less digits than its factorization.

664723607236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226171 (or 226169 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 52.

The spelling of 664723607236 in words is "six hundred sixty-four billion, seven hundred twenty-three million, six hundred seven thousand, two hundred thirty-six".