31745315816 has 16 divisors (see below), whose sum is σ = 59601107940. Its totient is φ = 15851687040.

The previous prime is 31745315803. The next prime is 31745315873. The reversal of 31745315816 is 61851354713.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27174203716 + 4571112100 = 164846^2 + 67610^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2614925 + ... + 2627036.

Almost surely, 2^31745315816 is an apocalyptic number.

It is an amenable number.

31745315816 is a deficient number, since it is larger than the sum of its proper divisors (27855792124).

31745315816 is a wasteful number, since it uses less digits than its factorization.

31745315816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5242724 (or 5242720 counting only the distinct ones).

The product of its digits is 302400, while the sum is 44.

The spelling of 31745315816 in words is "thirty-one billion, seven hundred forty-five million, three hundred fifteen thousand, eight hundred sixteen".