66935381732416 has 56 divisors (see below), whose sum is σ = 138440733576704. Its totient is φ = 32073640381440.

The previous prime is 66935381732413. The next prime is 66935381732431. The reversal of 66935381732416 is 61423718353966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is not an unprimeable number, because it can be changed into a prime (66935381732413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163570365 + ... + 163979068.

Almost surely, 2^{66935381732416} is an apocalyptic number.

It is an amenable number.

66935381732416 is an abundant number, since it is smaller than the sum of its proper divisors (71505351844288).

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

66935381732416 is a wasteful number, since it uses less digits than its factorization.

66935381732416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327549579 (or 327549569 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 64.

The spelling of 66935381732416 in words is "sixty-six trillion, nine hundred thirty-five billion, three hundred eighty-one million, seven hundred thirty-two thousand, four hundred sixteen".