688947825122 has 6 divisors (see below), whose sum is σ = 1033423498443. Its totient is φ = 344473325642.

The previous prime is 688947825113. The next prime is 688947825151. The reversal of 688947825122 is 221528749886.

It can be written as a sum of positive squares in only one way, i.e., 344473912561 + 344473912561 = 586919^2 + 586919^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=586919.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 880379 + ... + 1467297.

Almost surely, 2^688947825122 is an apocalyptic number.

688947825122 is a deficient number, since it is larger than the sum of its proper divisors (344475673321).

688947825122 is an frugal number, since it uses more digits than its factorization.

688947825122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173840 (or 586921 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 62.

The spelling of 688947825122 in words is "six hundred eighty-eight billion, nine hundred forty-seven million, eight hundred twenty-five thousand, one hundred twenty-two".