66600666288 has 120 divisors (see below), whose sum is σ = 208161499728. Its totient is φ = 20492497152.

The previous prime is 66600666287. The next prime is 66600666299. The reversal of 66600666288 is 88266600666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (66600666281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 608295 + ... + 709382.

Almost surely, 2^66600666288 is an apocalyptic number.

It is an amenable number.

66600666288 is an abundant number, since it is smaller than the sum of its proper divisors (141560833440).

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

66600666288 is a wasteful number, since it uses less digits than its factorization.

66600666288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1317713 (or 1317695 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 66600666288 in words is "sixty-six billion, six hundred million, six hundred sixty-six thousand, two hundred eighty-eight".