66368040680 has 16 divisors (see below), whose sum is σ = 149328091620. Its totient is φ = 26547216256.

The previous prime is 66368040671. The next prime is 66368040691. The reversal of 66368040680 is 8604086366.

It can be written as a sum of positive squares in 2 ways, for example, as 65645613796 + 722426884 = 256214^2 + 26878^2 .

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, 829600469 + ... + 829600548.

Almost surely, 2^66368040680 is an apocalyptic number.

It is an amenable number.

66368040680 is an abundant number, since it is smaller than the sum of its proper divisors (82960050940).

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

66368040680 is a wasteful number, since it uses less digits than its factorization.

66368040680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1659201028 (or 1659201024 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 47.

The spelling of 66368040680 in words is "sixty-six billion, three hundred sixty-eight million, forty thousand, six hundred eighty".