664445415 has 16 divisors (see below), whose sum is σ = 1065971808. Its totient is φ = 353417856.

The previous prime is 664445407. The next prime is 664445423. The reversal of 664445415 is 514544466.

It is an interprime number because it is at equal distance from previous prime (664445407) and next prime (664445423).

It is not a de Polignac number, because 664445415 - 2³ = 664445407 is a prime.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 53784 + ... + 64973.

It is an arithmetic number, because the mean of its divisors is an integer number (66623238).

Almost surely, 2^664445415 is an apocalyptic number.

664445415 is a deficient number, since it is larger than the sum of its proper divisors (401526393).

664445415 is a wasteful number, since it uses less digits than its factorization.

664445415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119138.

The product of its digits is 230400, while the sum is 39.

The square root of 664445415 is about 25776.8387316987. The cubic root of 664445415 is about 872.6091641531.

The spelling of 664445415 in words is "six hundred sixty-four million, four hundred forty-five thousand, four hundred fifteen".