664526918 has 12 divisors (see below), whose sum is σ = 1095646020. Its totient is φ = 302057580.

The previous prime is 664526873. The next prime is 664526927. The reversal of 664526918 is 819625466.

664526918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1372748 + ... + 1373231.

It is an arithmetic number, because the mean of its divisors is an integer number (91303835).

Almost surely, 2^664526918 is an apocalyptic number.

664526918 is a deficient number, since it is larger than the sum of its proper divisors (431119102).

664526918 is a wasteful number, since it uses less digits than its factorization.

664526918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2746003 (or 2745992 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The square root of 664526918 is about 25778.4196179673. The cubic root of 664526918 is about 872.6448417048.

The spelling of 664526918 in words is "six hundred sixty-four million, five hundred twenty-six thousand, nine hundred eighteen".