664654532 has 24 divisors (see below), whose sum is σ = 1205570520. Its totient is φ = 320371200.

The previous prime is 664654531. The next prime is 664654537. The reversal of 664654532 is 235456466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 418038916 + 246615616 = 20446^2 + 15704^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664654532.

It is not an unprimeable number, because it can be changed into a prime (664654531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4469 + ... + 36732.

It is an arithmetic number, because the mean of its divisors is an integer number (50232105).

Almost surely, 2^664654532 is an apocalyptic number.

It is an amenable number.

664654532 is a deficient number, since it is larger than the sum of its proper divisors (540915988).

664654532 is a wasteful number, since it uses less digits than its factorization.

664654532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41351 (or 41349 counting only the distinct ones).

The product of its digits is 518400, while the sum is 41.

The square root of 664654532 is about 25780.8947090670. The cubic root of 664654532 is about 872.7006982688.

The spelling of 664654532 in words is "six hundred sixty-four million, six hundred fifty-four thousand, five hundred thirty-two".