666038721272 has 16 divisors (see below), whose sum is σ = 1256300584560. Its totient is φ = 331025232064.

The previous prime is 666038721263. The next prime is 666038721307. The reversal of 666038721272 is 272127830666.

It is a self number, because there is not a number n which added to its sum of digits gives 666038721272.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249264653 + ... + 249267324.

It is an arithmetic number, because the mean of its divisors is an integer number (78518786535).

Almost surely, 2^666038721272 is an apocalyptic number.

It is an amenable number.

666038721272 is a deficient number, since it is larger than the sum of its proper divisors (590261863288).

666038721272 is a wasteful number, since it uses less digits than its factorization.

666038721272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498532150 (or 498532146 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 50.

The spelling of 666038721272 in words is "six hundred sixty-six billion, thirty-eight million, seven hundred twenty-one thousand, two hundred seventy-two".