664606165 has 16 divisors (see below), whose sum is σ = 818562240. Its totient is φ = 517841280.

The previous prime is 664606157. The next prime is 664606169. The reversal of 664606165 is 561606466.

It is not a de Polignac number, because 664606165 - 2³ = 664606157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664606169) by changing a digit.

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, 18670 + ... + 40960.

It is an arithmetic number, because the mean of its divisors is an integer number (51160140).

Almost surely, 2^664606165 is an apocalyptic number.

It is an amenable number.

664606165 is a deficient number, since it is larger than the sum of its proper divisors (153956075).

664606165 is a wasteful number, since it uses less digits than its factorization.

664606165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22452.

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

The square root of 664606165 is about 25779.9566524073. The cubic root of 664606165 is about 872.6795289061.

The spelling of 664606165 in words is "six hundred sixty-four million, six hundred six thousand, one hundred sixty-five".