66667599576666 has 96 divisors (see below), whose sum is σ = 164517554597760. Its totient is φ = 19313555817600.

The previous prime is 66667599576629. The next prime is 66667599576679.

66667599576666 is nontrivially palindromic in base 10.

66667599576666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4541800 + ... + 12408188.

It is an arithmetic number, because the mean of its divisors is an integer number (1713724527060).

Almost surely, 2^{66667599576666} is an apocalyptic number.

66667599576666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66667599576666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82258777298880).

66667599576666 is an abundant number, since it is smaller than the sum of its proper divisors (97849955021094).

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

66667599576666 is a wasteful number, since it uses less digits than its factorization.

66667599576666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7868292 (or 7868289 counting only the distinct ones).

The product of its digits is 166659897600, while the sum is 90.

The spelling of 66667599576666 in words is "sixty-six trillion, six hundred sixty-seven billion, five hundred ninety-nine million, five hundred seventy-six thousand, six hundred sixty-six".