66666688888887 has 12 divisors (see below), whose sum is σ = 96320111191200. Its totient is φ = 44433482584128.

The previous prime is 66666688888873. The next prime is 66666688888901. The reversal of 66666688888887 is 78888888666666.

It is an interprime number because it is at equal distance from previous prime (66666688888873) and next prime (66666688888901).

It is a de Polignac number, because none of the positive numbers 2^k-66666688888887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666688888487) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 914684463 + ... + 914757344.

It is an arithmetic number, because the mean of its divisors is an integer number (8026675932600).

Almost surely, 2^{66666688888887} is an apocalyptic number.

66666688888887 is a deficient number, since it is larger than the sum of its proper divisors (29653422302313).

66666688888887 is a wasteful number, since it uses less digits than its factorization.

66666688888887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829445862 (or 1829445859 counting only the distinct ones).

The product of its digits is 684913065984, while the sum is 99.

The spelling of 66666688888887 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred eighty-seven".