66666666699 has 48 divisors (see below), whose sum is σ = 99320352768. Its totient is φ = 43069605696.

The previous prime is 66666666697. The next prime is 66666666709. The reversal of 66666666699 is 99666666666.

It is not a de Polignac number, because 66666666699 - 2¹ = 66666666697 is a prime.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66666666697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19565854 + ... + 19569260.

It is an arithmetic number, because the mean of its divisors is an integer number (2069174016).

Almost surely, 2^66666666699 is an apocalyptic number.

66666666699 is a deficient number, since it is larger than the sum of its proper divisors (32653686069).

66666666699 is a wasteful number, since it uses less digits than its factorization.

66666666699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904 (or 3901 counting only the distinct ones).

The product of its digits is 816293376, while the sum is 72.

The spelling of 66666666699 in words is "sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred ninety-nine".