66555568 has 10 divisors (see below), whose sum is σ = 128951444. Its totient is φ = 33277776.

The previous prime is 66555553. The next prime is 66555581. The reversal of 66555568 is 86555566.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2079846 + ... + 2079877.

Almost surely, 2^66555568 is an apocalyptic number.

It is an amenable number.

66555568 is a deficient number, since it is larger than the sum of its proper divisors (62395876).

66555568 is a wasteful number, since it uses less digits than its factorization.

66555568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159731 (or 4159725 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 46.

The square root of 66555568 is about 8158.1595963796. The cubic root of 66555568 is about 405.2547662914.

The spelling of 66555568 in words is "sixty-six million, five hundred fifty-five thousand, five hundred sixty-eight".