31662721231644 has 24 divisors (see below), whose sum is σ = 74920241789568. Its totient is φ = 10405589136880.

The previous prime is 31662721231633. The next prime is 31662721231651. The reversal of 31662721231644 is 44613212726613.

It is a junction number, because it is equal to n+sod(n) for n = 31662721231593 and 31662721231602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18581408322 + ... + 18581410025.

It is an arithmetic number, because the mean of its divisors is an integer number (3121676741232).

Almost surely, 2^{31662721231644} is an apocalyptic number.

It is an amenable number.

31662721231644 is an abundant number, since it is smaller than the sum of its proper divisors (43257520557924).

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

31662721231644 is a wasteful number, since it uses less digits than its factorization.

31662721231644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37162818425 (or 37162818423 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 48.

The spelling of 31662721231644 in words is "thirty-one trillion, six hundred sixty-two billion, seven hundred twenty-one million, two hundred thirty-one thousand, six hundred forty-four".