667634360674256 has 20 divisors (see below), whose sum is σ = 1293542271753732. Its totient is φ = 333817000221696.

The previous prime is 667634360674247. The next prime is 667634360674289. The reversal of 667634360674256 is 652476063436766.

It can be written as a sum of positive squares in 2 ways, for example, as 415402281216400 + 252232079457856 = 20381420^2 + 15881816^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 667634360674256.

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, 22366370 + ... + 42843006.

Almost surely, 2^{667634360674256} is an apocalyptic number.

It is an amenable number.

667634360674256 is a deficient number, since it is larger than the sum of its proper divisors (625907911079476).

667634360674256 is a wasteful number, since it uses less digits than its factorization.

667634360674256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22514438 (or 22514432 counting only the distinct ones).

The product of its (nonzero) digits is 3292047360, while the sum is 71.

The spelling of 667634360674256 in words is "six hundred sixty-seven trillion, six hundred thirty-four billion, three hundred sixty million, six hundred seventy-four thousand, two hundred fifty-six".