664820704264 has 8 divisors (see below), whose sum is σ = 1246538820510. Its totient is φ = 332410352128.

The previous prime is 664820704231. The next prime is 664820704279. The reversal of 664820704264 is 462407028466.

It can be written as a sum of positive squares in only one way, i.e., 661473156100 + 3347548164 = 813310^2 + 57858^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41551294009 + ... + 41551294024.

Almost surely, 2^664820704264 is an apocalyptic number.

It is an amenable number.

664820704264 is a deficient number, since it is larger than the sum of its proper divisors (581718116246).

664820704264 is a wasteful number, since it uses less digits than its factorization.

664820704264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83102588039 (or 83102588035 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 49.

The spelling of 664820704264 in words is "six hundred sixty-four billion, eight hundred twenty million, seven hundred four thousand, two hundred sixty-four".