66666666672912 has 80 divisors (see below), whose sum is σ = 178163268071040. Its totient is φ = 21455655868416.

The previous prime is 66666666672911. The next prime is 66666666672913. The reversal of 66666666672912 is 21927666666666.

It is an interprime number because it is at equal distance from previous prime (66666666672911) and next prime (66666666672913).

It is not an unprimeable number, because it can be changed into a prime (66666666672911) 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 15 ways as a sum of consecutive naturals, for example, 122470813 + ... + 123013955.

It is an arithmetic number, because the mean of its divisors is an integer number (2227040850888).

Almost surely, 2^{66666666672912} is an apocalyptic number.

It is an amenable number.

66666666672912 is an abundant number, since it is smaller than the sum of its proper divisors (111496601398128).

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

66666666672912 is a wasteful number, since it uses less digits than its factorization.

66666666672912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631360 (or 631354 counting only the distinct ones).

The product of its digits is 2539579392, while the sum is 75.

The spelling of 66666666672912 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred seventy-two thousand, nine hundred twelve".