66666594072 has 128 divisors (see below), whose sum is σ = 180887616000. Its totient is φ = 20474363520.

The previous prime is 66666594019. The next prime is 66666594077. The reversal of 66666594072 is 27049566666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666594077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42761629 + ... + 42763187.

It is an arithmetic number, because the mean of its divisors is an integer number (1413184500).

Almost surely, 2^66666594072 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 66666594072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90443808000).

66666594072 is an abundant number, since it is smaller than the sum of its proper divisors (114221021928).

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

66666594072 is a wasteful number, since it uses less digits than its factorization.

66666594072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2418 (or 2388 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 57.

The spelling of 66666594072 in words is "sixty-six billion, six hundred sixty-six million, five hundred ninety-four thousand, seventy-two".