66696317836824 has 128 divisors (see below), whose sum is σ = 186080929272000. Its totient is φ = 19779948969984.

The previous prime is 66696317836817. The next prime is 66696317836847. The reversal of 66696317836824 is 42863871369666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1166989 + ... + 11608380.

Almost surely, 2^{66696317836824} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66696317836824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93040464636000).

66696317836824 is an abundant number, since it is smaller than the sum of its proper divisors (119384611435176).

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

66696317836824 is a wasteful number, since it uses less digits than its factorization.

66696317836824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12775997 (or 12775993 counting only the distinct ones).

The product of its digits is 2257403904, while the sum is 75.

The spelling of 66696317836824 in words is "sixty-six trillion, six hundred ninety-six billion, three hundred seventeen million, eight hundred thirty-six thousand, eight hundred twenty-four".