666786274992 has 60 divisors (see below), whose sum is σ = 1897703900040. Its totient is φ = 218494934784.

The previous prime is 666786274991. The next prime is 666786275033. The reversal of 666786274992 is 299472687666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 666786274992.

It is not an unprimeable number, because it can be changed into a prime (666786274991) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 39232693 + ... + 39249684.

It is an arithmetic number, because the mean of its divisors is an integer number (31628398334).

Almost surely, 2^666786274992 is an apocalyptic number.

It is an amenable number.

666786274992 is an abundant number, since it is smaller than the sum of its proper divisors (1230917625048).

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

666786274992 is a wasteful number, since it uses less digits than its factorization.

666786274992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78482450 (or 78482441 counting only the distinct ones).

The product of its digits is 658409472, while the sum is 72.

The spelling of 666786274992 in words is "six hundred sixty-six billion, seven hundred eighty-six million, two hundred seventy-four thousand, nine hundred ninety-two".