664630123905 has 32 divisors (see below), whose sum is σ = 1288979637120. Its totient is φ = 322244907840.

The previous prime is 664630123879. The next prime is 664630123919. The reversal of 664630123905 is 509321036466.

664630123905 is a `hidden beast` number, since 6 + 6 + 4 + 630 + 1 + 2 + 3 + 9 + 0 + 5 = 666.

It is not a de Polignac number, because 664630123905 - 2⁵ = 664630123873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223779702 + ... + 223782671.

It is an arithmetic number, because the mean of its divisors is an integer number (40280613660).

Almost surely, 2^664630123905 is an apocalyptic number.

It is an amenable number.

664630123905 is a deficient number, since it is larger than the sum of its proper divisors (624349513215).

664630123905 is a wasteful number, since it uses less digits than its factorization.

664630123905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447562398 (or 447562392 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 664630123905 in words is "six hundred sixty-four billion, six hundred thirty million, one hundred twenty-three thousand, nine hundred five".