66666666666666 has 64 divisors (see below), whose sum is σ = 146094720768000. Its totient is φ = 20113143523200.

The previous prime is 66666666666647. The next prime is 66666666666737.

66666666666666 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

66666666666666 is a modest number, since divided by 66666666 gives 666666 as remainder.

66666666666666 is a nontrivial repdigit in base 10.

It is a plaindrome in base 10.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72878781 + ... + 73787871.

It is an arithmetic number, because the mean of its divisors is an integer number (2282730012000).

Almost surely, 2^{66666666666666} is an apocalyptic number.

66666666666666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66666666666666 is an abundant number, since it is smaller than the sum of its proper divisors (79428054101334).

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

66666666666666 is a wasteful number, since it uses less digits than its factorization.

66666666666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913995.

The product of its digits is 78364164096, while the sum is 84.

The spelling of 66666666666666 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-six".