31306801978856 has 8 divisors (see below), whose sum is σ = 58700253710370. Its totient is φ = 15653400989424.

The previous prime is 31306801978849. The next prime is 31306801978883. The reversal of 31306801978856 is 65887910860313.

It can be written as a sum of positive squares in only one way, i.e., 20880787202500 + 10426014776356 = 4569550^2 + 3228934^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 31306801978792 and 31306801978801.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1956675123671 + ... + 1956675123686.

Almost surely, 2^{31306801978856} is an apocalyptic number.

It is an amenable number.

31306801978856 is a deficient number, since it is larger than the sum of its proper divisors (27393451731514).

31306801978856 is a wasteful number, since it uses less digits than its factorization.

31306801978856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3913350247363 (or 3913350247359 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 31306801978856 in words is "thirty-one trillion, three hundred six billion, eight hundred one million, nine hundred seventy-eight thousand, eight hundred fifty-six".