31817770642 has 24 divisors (see below), whose sum is σ = 55529186364. Its totient is φ = 13633627392.

The previous prime is 31817770619. The next prime is 31817770679. The reversal of 31817770642 is 24607771813.

It can be written as a sum of positive squares in 2 ways, for example, as 31705007481 + 112763161 = 178059^2 + 10619^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31817770592 and 31817770601.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 550378 + ... + 605434.

Almost surely, 2^31817770642 is an apocalyptic number.

31817770642 is a deficient number, since it is larger than the sum of its proper divisors (23711415722).

31817770642 is a wasteful number, since it uses less digits than its factorization.

31817770642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60970 (or 60963 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 31817770642 in words is "thirty-one billion, eight hundred seventeen million, seven hundred seventy thousand, six hundred forty-two".