664664165 has 16 divisors (see below), whose sum is σ = 870716736. Its totient is φ = 483052800.

The previous prime is 664664159. The next prime is 664664167. The reversal of 664664165 is 561466466.

It is not a de Polignac number, because 664664165 - 2⁶ = 664664101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664664167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96269 + ... + 102941.

It is an arithmetic number, because the mean of its divisors is an integer number (54419796).

Almost surely, 2^664664165 is an apocalyptic number.

It is an amenable number.

664664165 is a deficient number, since it is larger than the sum of its proper divisors (206052571).

664664165 is a wasteful number, since it uses less digits than its factorization.

664664165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8500.

The product of its digits is 622080, while the sum is 44.

The square root of 664664165 is about 25781.0815327829. The cubic root of 664664165 is about 872.7049143364.

The spelling of 664664165 in words is "six hundred sixty-four million, six hundred sixty-four thousand, one hundred sixty-five".