66413192720128 has 72 divisors (see below), whose sum is σ = 137216188497920. Its totient is φ = 32047851985920.

The previous prime is 66413192720123. The next prime is 66413192720177. The reversal of 66413192720128 is 82102729131466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66413192720123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8488848 + ... + 14313871.

Almost surely, 2^{66413192720128} is an apocalyptic number.

It is an amenable number.

66413192720128 is an abundant number, since it is smaller than the sum of its proper divisors (70802995777792).

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

66413192720128 is a wasteful number, since it uses less digits than its factorization.

66413192720128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22803133 (or 22803119 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 66413192720128 in words is "sixty-six trillion, four hundred thirteen billion, one hundred ninety-two million, seven hundred twenty thousand, one hundred twenty-eight".