66117439296 has 112 divisors (see below), whose sum is σ = 194488490880. Its totient is φ = 22026055680.

The previous prime is 66117439277. The next prime is 66117439301. The reversal of 66117439296 is 69293471166.

66117439296 is a `hidden beast` number, since 6 + 6 + 117 + 439 + 2 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3153520 + ... + 3174416.

Almost surely, 2^66117439296 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 66117439296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97244245440).

66117439296 is an abundant number, since it is smaller than the sum of its proper divisors (128371051584).

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

66117439296 is a wasteful number, since it uses less digits than its factorization.

66117439296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22749 (or 22733 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The spelling of 66117439296 in words is "sixty-six billion, one hundred seventeen million, four hundred thirty-nine thousand, two hundred ninety-six".