666915215696612 has 12 divisors (see below), whose sum is σ = 1167409002167100. Its totient is φ = 333369786506016.

The previous prime is 666915215696531. The next prime is 666915215696623. The reversal of 666915215696612 is 216696512519666.

It can be written as a sum of positive squares in 2 ways, for example, as 241165805076196 + 425749410620416 = 15529514^2 + 20633696^2 .

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, 21955318487 + ... + 21955348862.

It is an arithmetic number, because the mean of its divisors is an integer number (97284083513925).

Almost surely, 2^{666915215696612} is an apocalyptic number.

It is an amenable number.

666915215696612 is a deficient number, since it is larger than the sum of its proper divisors (500493786470488).

666915215696612 is a wasteful number, since it uses less digits than its factorization.

666915215696612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43910671150 (or 43910671148 counting only the distinct ones).

The product of its digits is 377913600, while the sum is 71.

The spelling of 666915215696612 in words is "six hundred sixty-six trillion, nine hundred fifteen billion, two hundred fifteen million, six hundred ninety-six thousand, six hundred twelve".