31777984856 has 8 divisors (see below), whose sum is σ = 59583721620. Its totient is φ = 15888992424.

The previous prime is 31777984811. The next prime is 31777984883. The reversal of 31777984856 is 65848977713.

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 = 31777984792 and 31777984801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1986124046 + ... + 1986124061.

Almost surely, 2^31777984856 is an apocalyptic number.

It is an amenable number.

31777984856 is a deficient number, since it is larger than the sum of its proper divisors (27805736764).

31777984856 is a wasteful number, since it uses less digits than its factorization.

31777984856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972248113 (or 3972248109 counting only the distinct ones).

The product of its digits is 71124480, while the sum is 65.

The spelling of 31777984856 in words is "thirty-one billion, seven hundred seventy-seven million, nine hundred eighty-four thousand, eight hundred fifty-six".