664445715 has 16 divisors (see below), whose sum is σ = 1070764800. Its totient is φ = 351820512.

The previous prime is 664445701. The next prime is 664445773. The reversal of 664445715 is 517544466.

664445715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664445715 - 2¹⁰ = 664444691 is a prime.

It is a super-2 number, since 2×664445715² = 882976216363722450, which contains 22 as substring.

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, 157255 + ... + 161424.

It is an arithmetic number, because the mean of its divisors is an integer number (66922800).

Almost surely, 2^664445715 is an apocalyptic number.

664445715 is a deficient number, since it is larger than the sum of its proper divisors (406319085).

664445715 is a wasteful number, since it uses less digits than its factorization.

664445715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318826.

The product of its digits is 403200, while the sum is 42.

The square root of 664445715 is about 25776.8445508755. The cubic root of 664445715 is about 872.6092954820.

The spelling of 664445715 in words is "six hundred sixty-four million, four hundred forty-five thousand, seven hundred fifteen".