664999452 has 54 divisors (see below), whose sum is σ = 1820239512. Its totient is φ = 204613344.

The previous prime is 664999441. The next prime is 664999469. The reversal of 664999452 is 254999466.

It is a happy number.

664999452 is a `hidden beast` number, since 66 + 49 + 99 + 452 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48568 + ... + 60735.

Almost surely, 2^664999452 is an apocalyptic number.

It is an amenable number.

664999452 is an abundant number, since it is smaller than the sum of its proper divisors (1155240060).

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

664999452 is a wasteful number, since it uses less digits than its factorization.

664999452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109339 (or 109321 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 664999452 is about 25787.5832911888. The cubic root of 664999452 is about 872.8516337577.

The spelling of 664999452 in words is "six hundred sixty-four million, nine hundred ninety-nine thousand, four hundred fifty-two".