31806163686887 has 8 divisors (see below), whose sum is σ = 34312531747536. Its totient is φ = 29370397543552.

The previous prime is 31806163686833. The next prime is 31806163686901. The reversal of 31806163686887 is 78868636160813.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31806163686887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31806163686887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31806163686487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17650478393 + ... + 17650480194.

It is an arithmetic number, because the mean of its divisors is an integer number (4289066468442).

Almost surely, 2^{31806163686887} is an apocalyptic number.

31806163686887 is a deficient number, since it is larger than the sum of its proper divisors (2506368060649).

31806163686887 is a wasteful number, since it uses less digits than its factorization.

31806163686887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35300958657.

The product of its (nonzero) digits is 334430208, while the sum is 71.

The spelling of 31806163686887 in words is "thirty-one trillion, eight hundred six billion, one hundred sixty-three million, six hundred eighty-six thousand, eight hundred eighty-seven".