31860616745 has 4 divisors (see below), whose sum is σ = 38232740100. Its totient is φ = 25488493392.

The previous prime is 31860616717. The next prime is 31860616763. The reversal of 31860616745 is 54761606813.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7553000464 + 24307616281 = 86908^2 + 155909^2 .

It is a cyclic number.

It is not a de Polignac number, because 31860616745 - 2⁶ = 31860616681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31860616745.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3186061670 + ... + 3186061679.

It is an arithmetic number, because the mean of its divisors is an integer number (9558185025).

Almost surely, 2^31860616745 is an apocalyptic number.

It is an amenable number.

31860616745 is a deficient number, since it is larger than the sum of its proper divisors (6372123355).

31860616745 is an equidigital number, since it uses as much as digits as its factorization.

31860616745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6372123354.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 31860616745 in words is "thirty-one billion, eight hundred sixty million, six hundred sixteen thousand, seven hundred forty-five".