66013732688 has 40 divisors (see below), whose sum is σ = 134836608000. Its totient is φ = 31262497920.

The previous prime is 66013732649. The next prime is 66013732709. The reversal of 66013732688 is 88623731066.

It is a congruent number.

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, 1392563 + ... + 1439186.

It is an arithmetic number, because the mean of its divisors is an integer number (3370915200).

Almost surely, 2^66013732688 is an apocalyptic number.

It is an amenable number.

66013732688 is an abundant number, since it is smaller than the sum of its proper divisors (68822875312).

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

66013732688 is a wasteful number, since it uses less digits than its factorization.

66013732688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2831835 (or 2831829 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 66013732688 in words is "sixty-six billion, thirteen million, seven hundred thirty-two thousand, six hundred eighty-eight".