664012515 has 16 divisors (see below), whose sum is σ = 1070788608. Its totient is φ = 351350496.

The previous prime is 664012499. The next prime is 664012549. The reversal of 664012515 is 515210466.

It is not a de Polignac number, because 664012515 - 2⁴ = 664012499 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172377 + ... + 176186.

It is an arithmetic number, because the mean of its divisors is an integer number (66924288).

Almost surely, 2^664012515 is an apocalyptic number.

664012515 is a deficient number, since it is larger than the sum of its proper divisors (406776093).

664012515 is a wasteful number, since it uses less digits than its factorization.

664012515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348698.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 664012515 is about 25768.4402904017. The cubic root of 664012515 is about 872.4196153122.

The spelling of 664012515 in words is "six hundred sixty-four million, twelve thousand, five hundred fifteen".