31668916725 has 36 divisors (see below), whose sum is σ = 57359916900. Its totient is φ = 16700302080.

The previous prime is 31668916711. The next prime is 31668916781. The reversal of 31668916725 is 52761986613.

It can be written as a sum of positive squares in 6 ways, for example, as 4322010564 + 27346906161 = 65742^2 + 165369^2 .

It is not a de Polignac number, because 31668916725 - 2⁵ = 31668916693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 770710 + ... + 810759.

It is an arithmetic number, because the mean of its divisors is an integer number (1593331025).

Almost surely, 2^31668916725 is an apocalyptic number.

It is an amenable number.

31668916725 is a deficient number, since it is larger than the sum of its proper divisors (25691000175).

31668916725 is a wasteful number, since it uses less digits than its factorization.

31668916725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581574 (or 1581566 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 31668916725 in words is "thirty-one billion, six hundred sixty-eight million, nine hundred sixteen thousand, seven hundred twenty-five".