664123515008 has 24 divisors (see below), whose sum is σ = 1323076933215. Its totient is φ = 332057147520.

The previous prime is 664123514987. The next prime is 664123515049. The reversal of 664123515008 is 800515321466.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 332061757504 + 332061757504 = 576248^2 + 576248^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=576248.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9183953 + ... + 9255983.

Almost surely, 2^664123515008 is an apocalyptic number.

It is an amenable number.

664123515008 is a deficient number, since it is larger than the sum of its proper divisors (658953418207).

664123515008 is an frugal number, since it uses more digits than its factorization.

664123515008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144076 (or 72033 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 664123515008 in words is "six hundred sixty-four billion, one hundred twenty-three million, five hundred fifteen thousand, eight".