668081480068 has 6 divisors (see below), whose sum is σ = 1169142590126. Its totient is φ = 334040740032.

The previous prime is 668081479957. The next prime is 668081480147. The reversal of 668081480068 is 860084180866.

It can be written as a sum of positive squares in only one way, i.e., 627276672064 + 40804808004 = 792008^2 + 202002^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83510185005 + ... + 83510185012.

Almost surely, 2^668081480068 is an apocalyptic number.

It is an amenable number.

668081480068 is a deficient number, since it is larger than the sum of its proper divisors (501061110058).

668081480068 is a wasteful number, since it uses less digits than its factorization.

668081480068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167020370021 (or 167020370019 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 55.

The spelling of 668081480068 in words is "six hundred sixty-eight billion, eighty-one million, four hundred eighty thousand, sixty-eight".