664654524 has 12 divisors (see below), whose sum is σ = 1550860584. Its totient is φ = 221551504.

The previous prime is 664654519. The next prime is 664654531. The reversal of 664654524 is 425456466.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27693927 + ... + 27693950.

It is an arithmetic number, because the mean of its divisors is an integer number (129238382).

Almost surely, 2^664654524 is an apocalyptic number.

It is an amenable number.

664654524 is an abundant number, since it is smaller than the sum of its proper divisors (886206060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664654524 is a wasteful number, since it uses less digits than its factorization.

664654524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55387884 (or 55387882 counting only the distinct ones).

The product of its digits is 691200, while the sum is 42.

The square root of 664654524 is about 25780.8945539134. The cubic root of 664654524 is about 872.7006947675.

The spelling of 664654524 in words is "six hundred sixty-four million, six hundred fifty-four thousand, five hundred twenty-four".