664518086 has 8 divisors (see below), whose sum is σ = 1008786744. Its totient is φ = 328255840.

The previous prime is 664518031. The next prime is 664518109. The reversal of 664518086 is 680815466.

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

It is a super-2 number, since 2×664518086² = 883168573242206792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2001395 + ... + 2001726.

It is an arithmetic number, because the mean of its divisors is an integer number (126098343).

Almost surely, 2^664518086 is an apocalyptic number.

664518086 is a deficient number, since it is larger than the sum of its proper divisors (344268658).

664518086 is a wasteful number, since it uses less digits than its factorization.

664518086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003206.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 664518086 is about 25778.2483113186. The cubic root of 664518086 is about 872.6409756796.

The spelling of 664518086 in words is "six hundred sixty-four million, five hundred eighteen thousand, eighty-six".