66841422829728 has 96 divisors (see below), whose sum is σ = 180246975753600. Its totient is φ = 21672751887360.

The previous prime is 66841422829679. The next prime is 66841422829747. The reversal of 66841422829728 is 82792822414866.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

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, 11486098 + ... + 16297646.

It is an arithmetic number, because the mean of its divisors is an integer number (1877572664100).

Almost surely, 2^{66841422829728} 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 66841422829728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90123487876800).

66841422829728 is an abundant number, since it is smaller than the sum of its proper divisors (113405552923872).

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

66841422829728 is a wasteful number, since it uses less digits than its factorization.

66841422829728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4815510 (or 4815502 counting only the distinct ones).

The product of its digits is 297271296, while the sum is 69.

The spelling of 66841422829728 in words is "sixty-six trillion, eight hundred forty-one billion, four hundred twenty-two million, eight hundred twenty-nine thousand, seven hundred twenty-eight".