668112644 has 12 divisors (see below), whose sum is σ = 1185214044. Its totient is φ = 329480064.

The previous prime is 668112617. The next prime is 668112659. The reversal of 668112644 is 446211866.

It can be written as a sum of positive squares in 2 ways, for example, as 395532544 + 272580100 = 19888^2 + 16510^2 .

It is a junction number, because it is equal to n+sod(n) for n = 668112598 and 668112607.

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, 1143737 + ... + 1144320.

It is an arithmetic number, because the mean of its divisors is an integer number (98767837).

Almost surely, 2^668112644 is an apocalyptic number.

It is an amenable number.

668112644 is a deficient number, since it is larger than the sum of its proper divisors (517101400).

668112644 is a wasteful number, since it uses less digits than its factorization.

668112644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2288134 (or 2288132 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 668112644 is about 25847.8750383857. The cubic root of 668112644 is about 874.2115974296.

The spelling of 668112644 in words is "six hundred sixty-eight million, one hundred twelve thousand, six hundred forty-four".