66618568 has 16 divisors (see below), whose sum is σ = 129217500. Its totient is φ = 32160576.

The previous prime is 66618523. The next prime is 66618571. The reversal of 66618568 is 86581666.

It can be written as a sum of positive squares in 2 ways, for example, as 66618244 + 324 = 8162^2 + 18^2 .

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, 143343 + ... + 143806.

Almost surely, 2^66618568 is an apocalyptic number.

It is an amenable number.

66618568 is a deficient number, since it is larger than the sum of its proper divisors (62598932).

66618568 is a wasteful number, since it uses less digits than its factorization.

66618568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287184 (or 287180 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 66618568 is about 8162.0198480523. The cubic root of 66618568 is about 405.3825943083.

The spelling of 66618568 in words is "sixty-six million, six hundred eighteen thousand, five hundred sixty-eight".