31368261865 has 16 divisors (see below), whose sum is σ = 38884571136. Its totient is φ = 24267355200.

The previous prime is 31368261851. The next prime is 31368261877. The reversal of 31368261865 is 56816286313.

It is not a de Polignac number, because 31368261865 - 2¹⁵ = 31368229097 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 140784 + ... + 287326.

It is an arithmetic number, because the mean of its divisors is an integer number (2430285696).

Almost surely, 2^31368261865 is an apocalyptic number.

It is an amenable number.

31368261865 is a deficient number, since it is larger than the sum of its proper divisors (7516309271).

31368261865 is a wasteful number, since it uses less digits than its factorization.

31368261865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147960.

The product of its digits is 1244160, while the sum is 49.

The spelling of 31368261865 in words is "thirty-one billion, three hundred sixty-eight million, two hundred sixty-one thousand, eight hundred sixty-five".