66813468176 has 80 divisors (see below), whose sum is σ = 162025046400. Its totient is φ = 25983673344.

The previous prime is 66813468151. The next prime is 66813468179. The reversal of 66813468176 is 67186431866.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is not an unprimeable number, because it can be changed into a prime (66813468179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 302981 + ... + 474788.

It is an arithmetic number, because the mean of its divisors is an integer number (2025313080).

Almost surely, 2^66813468176 is an apocalyptic number.

It is an amenable number.

66813468176 is an abundant number, since it is smaller than the sum of its proper divisors (95211578224).

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

66813468176 is a wasteful number, since it uses less digits than its factorization.

66813468176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777856 (or 777850 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 56.

The spelling of 66813468176 in words is "sixty-six billion, eight hundred thirteen million, four hundred sixty-eight thousand, one hundred seventy-six".