668537662112 has 12 divisors (see below), whose sum is σ = 1316183522346. Its totient is φ = 334268831040.

The previous prime is 668537662063. The next prime is 668537662201. The reversal of 668537662112 is 211266735866.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 668136220816 + 401441296 = 817396^2 + 20036^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10445900939 + ... + 10445901002.

Almost surely, 2^668537662112 is an apocalyptic number.

It is an amenable number.

668537662112 is a deficient number, since it is larger than the sum of its proper divisors (647645860234).

668537662112 is a wasteful number, since it uses less digits than its factorization.

668537662112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20891801951 (or 20891801943 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 53.

The spelling of 668537662112 in words is "six hundred sixty-eight billion, five hundred thirty-seven million, six hundred sixty-two thousand, one hundred twelve".