66201632784 has 120 divisors (see below), whose sum is σ = 212000077952. Its totient is φ = 18891532800.

The previous prime is 66201632779. The next prime is 66201632801. The reversal of 66201632784 is 48723610266.

66201632784 is a `hidden beast` number, since 6 + 6 + 2 + 0 + 1 + 632 + 7 + 8 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 789684 + ... + 869484.

Almost surely, 2^66201632784 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 66201632784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106000038976).

66201632784 is an abundant number, since it is smaller than the sum of its proper divisors (145798445168).

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

66201632784 is a wasteful number, since it uses less digits than its factorization.

66201632784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80645 (or 80636 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 66201632784 in words is "sixty-six billion, two hundred one million, six hundred thirty-two thousand, seven hundred eighty-four".