31218848668 has 18 divisors (see below), whose sum is σ = 62439567288. Its totient is φ = 13379105880.

The previous prime is 31218848663. The next prime is 31218848669. The reversal of 31218848668 is 86684881213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31218848663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 918253 + ... + 951643.

Almost surely, 2^31218848668 is an apocalyptic number.

It is an amenable number.

31218848668 is an abundant number, since it is smaller than the sum of its proper divisors (31220718620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31218848668 is an frugal number, since it uses more digits than its factorization.

31218848668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66793 (or 33400 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 55.

The spelling of 31218848668 in words is "thirty-one billion, two hundred eighteen million, eight hundred forty-eight thousand, six hundred sixty-eight".