664934215 has 32 divisors (see below), whose sum is σ = 899148096. Its totient is φ = 467804160.

The previous prime is 664934177. The next prime is 664934233. The reversal of 664934215 is 512439466.

664934215 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 664934215 - 2¹⁷ = 664803143 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 391909 + ... + 393601.

It is an arithmetic number, because the mean of its divisors is an integer number (28098378).

Almost surely, 2^664934215 is an apocalyptic number.

664934215 is a deficient number, since it is larger than the sum of its proper divisors (234213881).

664934215 is a wasteful number, since it uses less digits than its factorization.

664934215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939.

The product of its digits is 155520, while the sum is 40.

The square root of 664934215 is about 25786.3183684682. The cubic root of 664934215 is about 872.8230903336.

The spelling of 664934215 in words is "six hundred sixty-four million, nine hundred thirty-four thousand, two hundred fifteen".