31538116656 has 120 divisors (see below), whose sum is σ = 91377090480. Its totient is φ = 10142350848.

The previous prime is 31538116607. The next prime is 31538116667. The reversal of 31538116656 is 65661183513.

31538116656 is a `hidden beast` number, since 3 + 1 + 538 + 1 + 1 + 66 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8070255 + ... + 8074161.

It is an arithmetic number, because the mean of its divisors is an integer number (761475754).

Almost surely, 2^31538116656 is an apocalyptic number.

31538116656 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31538116656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45688545240).

31538116656 is an abundant number, since it is smaller than the sum of its proper divisors (59838973824).

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

31538116656 is a wasteful number, since it uses less digits than its factorization.

31538116656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5883 (or 5874 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The spelling of 31538116656 in words is "thirty-one billion, five hundred thirty-eight million, one hundred sixteen thousand, six hundred fifty-six".