66666878313912 has 128 divisors (see below), whose sum is σ = 188988143635200. Its totient is φ = 21769673270400.

The previous prime is 66666878313899. The next prime is 66666878313941. The reversal of 66666878313912 is 21931387866666.

66666878313912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×66666878313912² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent 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 31 ways as a sum of consecutive naturals, for example, 10106014 + ... + 15344877.

It is an arithmetic number, because the mean of its divisors is an integer number (1476469872150).

Almost surely, 2^{66666878313912} is an apocalyptic number.

It is an amenable number.

66666878313912 is an abundant number, since it is smaller than the sum of its proper divisors (122321265321288).

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

66666878313912 is a wasteful number, since it uses less digits than its factorization.

66666878313912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25451154 (or 25451144 counting only the distinct ones).

The product of its digits is 564350976, while the sum is 72.

The spelling of 66666878313912 in words is "sixty-six trillion, six hundred sixty-six billion, eight hundred seventy-eight million, three hundred thirteen thousand, nine hundred twelve".