66635038812 has 24 divisors (see below), whose sum is σ = 155539440000. Its totient is φ = 22203439216.

The previous prime is 66635038807. The next prime is 66635038853. The reversal of 66635038812 is 21883053666.

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, 996312 + ... + 1061087.

It is an arithmetic number, because the mean of its divisors is an integer number (6480810000).

Almost surely, 2^66635038812 is an apocalyptic number.

It is an amenable number.

66635038812 is an abundant number, since it is smaller than the sum of its proper divisors (88904401188).

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

66635038812 is a wasteful number, since it uses less digits than its factorization.

66635038812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060105 (or 2060103 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The spelling of 66635038812 in words is "sixty-six billion, six hundred thirty-five million, thirty-eight thousand, eight hundred twelve".