664165015 has 8 divisors (see below), whose sum is σ = 798155568. Its totient is φ = 530560320.

The previous prime is 664164973. The next prime is 664165031. The reversal of 664165015 is 510561466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 664165015 - 2⁷ = 664164887 is a prime.

It is a super-2 number, since 2×664165015² = 882230334299900450, which contains 22 as substring.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 92662 + ... + 99571.

It is an arithmetic number, because the mean of its divisors is an integer number (99769446).

Almost surely, 2^664165015 is an apocalyptic number.

664165015 is a deficient number, since it is larger than the sum of its proper divisors (133990553).

664165015 is a wasteful number, since it uses less digits than its factorization.

664165015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192929.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 664165015 is about 25771.3991665179. The cubic root of 664165015 is about 872.4863980934.

The spelling of 664165015 in words is "six hundred sixty-four million, one hundred sixty-five thousand, fifteen".