668353661256 has 32 divisors (see below), whose sum is σ = 1675363757760. Its totient is φ = 222187273152.

The previous prime is 668353661231. The next prime is 668353661257. The reversal of 668353661256 is 652166353866.

It is a junction number, because it is equal to n+sod(n) for n = 668353661196 and 668353661205.

It is not an unprimeable number, because it can be changed into a prime (668353661257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37320900 + ... + 37338803.

It is an arithmetic number, because the mean of its divisors is an integer number (52355117430).

Almost surely, 2^668353661256 is an apocalyptic number.

It is an amenable number.

668353661256 is an abundant number, since it is smaller than the sum of its proper divisors (1007010096504).

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

668353661256 is a wasteful number, since it uses less digits than its factorization.

668353661256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74660085 (or 74660081 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 57.

The spelling of 668353661256 in words is "six hundred sixty-eight billion, three hundred fifty-three million, six hundred sixty-one thousand, two hundred fifty-six".