66680006800 has 60 divisors (see below), whose sum is σ = 174762247536. Its totient is φ = 24247273600.

The previous prime is 66680006777. The next prime is 66680006863. The reversal of 66680006800 is 860008666.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7572874 + ... + 7581673.

Almost surely, 2^66680006800 is an apocalyptic number.

It is an amenable number.

66680006800 is an abundant number, since it is smaller than the sum of its proper divisors (108082240736).

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

66680006800 is a wasteful number, since it uses less digits than its factorization.

66680006800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15154576 (or 15154565 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 66680006800 in words is "sixty-six billion, six hundred eighty million, six thousand, eight hundred".