66291786204732 has 144 divisors (see below), whose sum is σ = 189001797428640. Its totient is φ = 20078904637440.

The previous prime is 66291786204731. The next prime is 66291786204751. The reversal of 66291786204732 is 23740268719266.

66291786204732 is a `hidden beast` number, since 6 + 6 + 2 + 91 + 78 + 6 + 2 + 0 + 473 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 66291786204732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66291786204731) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26412298 + ... + 28813070.

Almost surely, 2^{66291786204732} 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 66291786204732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94500898714320).

66291786204732 is an abundant number, since it is smaller than the sum of its proper divisors (122710011223908).

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

66291786204732 is a wasteful number, since it uses less digits than its factorization.

66291786204732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2402921 (or 2402902 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 63.

The spelling of 66291786204732 in words is "sixty-six trillion, two hundred ninety-one billion, seven hundred eighty-six million, two hundred four thousand, seven hundred thirty-two".