66402011688 has 32 divisors (see below), whose sum is σ = 166086967200. Its totient is φ = 22123078848.

The previous prime is 66402011657. The next prime is 66402011707. The reversal of 66402011688 is 88611020466.

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, 633106 + ... + 730497.

It is an arithmetic number, because the mean of its divisors is an integer number (5190217725).

Almost surely, 2^66402011688 is an apocalyptic number.

It is an amenable number.

66402011688 is an abundant number, since it is smaller than the sum of its proper divisors (99684955512).

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

66402011688 is a wasteful number, since it uses less digits than its factorization.

66402011688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365641 (or 1365637 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The spelling of 66402011688 in words is "sixty-six billion, four hundred two million, eleven thousand, six hundred eighty-eight".