31918210648 has 8 divisors (see below), whose sum is σ = 59846644980. Its totient is φ = 15959105320.

The previous prime is 31918210619. The next prime is 31918210703. The reversal of 31918210648 is 84601281913.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994888158 + ... + 1994888173.

Almost surely, 2^31918210648 is an apocalyptic number.

It is an amenable number.

31918210648 is a deficient number, since it is larger than the sum of its proper divisors (27928434332).

31918210648 is a wasteful number, since it uses less digits than its factorization.

31918210648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3989776337 (or 3989776333 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The spelling of 31918210648 in words is "thirty-one billion, nine hundred eighteen million, two hundred ten thousand, six hundred forty-eight".