666986815412 has 12 divisors (see below), whose sum is σ = 1167237175776. Its totient is φ = 333490479480.

The previous prime is 666986815403. The next prime is 666986815441. The reversal of 666986815412 is 214518689666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171938 + ... + 1167705.

It is an arithmetic number, because the mean of its divisors is an integer number (97269764648).

Almost surely, 2^666986815412 is an apocalyptic number.

It is an amenable number.

666986815412 is a deficient number, since it is larger than the sum of its proper divisors (500250360364).

666986815412 is a wasteful number, since it uses less digits than its factorization.

666986815412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464118 (or 1464116 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 62.

The spelling of 666986815412 in words is "six hundred sixty-six billion, nine hundred eighty-six million, eight hundred fifteen thousand, four hundred twelve".