664954452 has 18 divisors (see below), whose sum is σ = 1680857178. Its totient is φ = 221651472.

The previous prime is 664954447. The next prime is 664954463. The reversal of 664954452 is 254459466.

664954452 is a `hidden beast` number, since 66 + 49 + 544 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 523677456 + 141276996 = 22884^2 + 11886^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 664954398 and 664954407.

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, 9235443 + ... + 9235514.

Almost surely, 2^664954452 is an apocalyptic number.

It is an amenable number.

664954452 is an abundant number, since it is smaller than the sum of its proper divisors (1015902726).

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

664954452 is a wasteful number, since it uses less digits than its factorization.

664954452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18470967 (or 18470962 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 664954452 is about 25786.7107634921. The cubic root of 664954452 is about 872.8319449147.

The spelling of 664954452 in words is "six hundred sixty-four million, nine hundred fifty-four thousand, four hundred fifty-two".