31778125775668 has 12 divisors (see below), whose sum is σ = 55693864455012. Its totient is φ = 15865593074240.

The previous prime is 31778125775623. The next prime is 31778125775677. The reversal of 31778125775668 is 86657752187713.

It can be written as a sum of positive squares in 2 ways, for example, as 31407259391524 + 370866384144 = 5604218^2 + 608988^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31778125775668.

It is a congruent number.

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, 5867450353 + ... + 5867455768.

It is an arithmetic number, because the mean of its divisors is an integer number (4641155371251).

Almost surely, 2^{31778125775668} is an apocalyptic number.

It is an amenable number.

31778125775668 is a deficient number, since it is larger than the sum of its proper divisors (23915738679344).

31778125775668 is a wasteful number, since it uses less digits than its factorization.

31778125775668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11734906802 (or 11734906800 counting only the distinct ones).

The product of its digits is 829785600, while the sum is 73.

The spelling of 31778125775668 in words is "thirty-one trillion, seven hundred seventy-eight billion, one hundred twenty-five million, seven hundred seventy-five thousand, six hundred sixty-eight".