31663121320000 has 70 divisors (see below), whose sum is σ = 78514250458358. Its totient is φ = 12665248512000.

The previous prime is 31663121319979. The next prime is 31663121320001. The reversal of 31663121320000 is 2312136613.

It can be written as a sum of positive squares in 5 ways, for example, as 21633587020864 + 10029534299136 = 4651192^2 + 3166944^2 .

It is not an unprimeable number, because it can be changed into a prime (31663121320001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 395749017 + ... + 395829016.

Almost surely, 2^{31663121320000} is an apocalyptic number.

It is an amenable number.

31663121320000 is an abundant number, since it is smaller than the sum of its proper divisors (46851129138358).

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

31663121320000 is an frugal number, since it uses more digits than its factorization.

31663121320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791578065 (or 791578040 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

Adding to 31663121320000 its reverse (2312136613), we get a palindrome (31665433456613).

The spelling of 31663121320000 in words is "thirty-one trillion, six hundred sixty-three billion, one hundred twenty-one million, three hundred twenty thousand".