31720840338763 has 16 divisors (see below), whose sum is σ = 32913761260320. Its totient is φ = 30534665462784.

The previous prime is 31720840338751. The next prime is 31720840338791. The reversal of 31720840338763 is 36783304802713.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31720840338763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31720840338563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11500120 + ... + 13989082.

It is an arithmetic number, because the mean of its divisors is an integer number (2057110078770).

Almost surely, 2^{31720840338763} is an apocalyptic number.

31720840338763 is a deficient number, since it is larger than the sum of its proper divisors (1192920921557).

31720840338763 is a wasteful number, since it uses less digits than its factorization.

31720840338763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490318.

The product of its (nonzero) digits is 12192768, while the sum is 55.

The spelling of 31720840338763 in words is "thirty-one trillion, seven hundred twenty billion, eight hundred forty million, three hundred thirty-eight thousand, seven hundred sixty-three".