668405552 has 20 divisors (see below), whose sum is σ = 1297710096. Its totient is φ = 333512640.

The previous prime is 668405533. The next prime is 668405561. The reversal of 668405552 is 255504866.

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, 35099 + ... + 50682.

Almost surely, 2^668405552 is an apocalyptic number.

It is an amenable number.

668405552 is a deficient number, since it is larger than the sum of its proper divisors (629304544).

668405552 is a wasteful number, since it uses less digits than its factorization.

668405552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86276 (or 86270 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 41.

The square root of 668405552 is about 25853.5404151927. The cubic root of 668405552 is about 874.3393334542.

The spelling of 668405552 in words is "six hundred sixty-eight million, four hundred five thousand, five hundred fifty-two".