31661667145316 has 144 divisors (see below), whose sum is σ = 66697817785200. Its totient is φ = 13026203688960.

The previous prime is 31661667145247. The next prime is 31661667145319. The reversal of 31661667145316 is 61354176616613.

It can be written as a sum of positive squares in 8 ways, for example, as 10995060174400 + 20666606970916 = 3315880^2 + 4546054^2 .

It is a super-2 number, since 2×31661667145316² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31661667145319) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1483596806 + ... + 1483618146.

It is an arithmetic number, because the mean of its divisors is an integer number (463179290175).

Almost surely, 2^{31661667145316} is an apocalyptic number.

It is an amenable number.

31661667145316 is an abundant number, since it is smaller than the sum of its proper divisors (35036150639884).

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

31661667145316 is a wasteful number, since it uses less digits than its factorization.

31661667145316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26062 (or 26041 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 56.

The spelling of 31661667145316 in words is "thirty-one trillion, six hundred sixty-one billion, six hundred sixty-seven million, one hundred forty-five thousand, three hundred sixteen".