66666736704 has 56 divisors (see below), whose sum is σ = 185672719840. Its totient is φ = 21052652544.

The previous prime is 66666736693. The next prime is 66666736781. The reversal of 66666736704 is 40763766666.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9133789 + ... + 9141084.

Almost surely, 2^66666736704 is an apocalyptic number.

66666736704 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66666736704 is an abundant number, since it is smaller than the sum of its proper divisors (119005983136).

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

66666736704 is a wasteful number, since it uses less digits than its factorization.

66666736704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18274907 (or 18274897 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 57.

The spelling of 66666736704 in words is "sixty-six billion, six hundred sixty-six million, seven hundred thirty-six thousand, seven hundred four".