664755706 has 16 divisors (see below), whose sum is σ = 1042113600. Its totient is φ = 317429728.

The previous prime is 664755677. The next prime is 664755713. The reversal of 664755706 is 607557466.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19350 + ... + 41278.

It is an arithmetic number, because the mean of its divisors is an integer number (65132100).

Almost surely, 2^664755706 is an apocalyptic number.

664755706 is a deficient number, since it is larger than the sum of its proper divisors (377357894).

664755706 is a wasteful number, since it uses less digits than its factorization.

664755706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22613.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The square root of 664755706 is about 25782.8568238665. The cubic root of 664755706 is about 872.7449769813.

The spelling of 664755706 in words is "six hundred sixty-four million, seven hundred fifty-five thousand, seven hundred six".