83117157987 has 32 divisors (see below), whose sum is σ = 113235992064. Its totient is φ = 54218304000.

The previous prime is 83117157973. The next prime is 83117158031. The reversal of 83117157987 is 78975171138.

It is not a de Polignac number, because 83117157987 - 2¹² = 83117153891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83117157287) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 16291737 + ... + 16296837.

It is an arithmetic number, because the mean of its divisors is an integer number (3538624752).

Almost surely, 2^83117157987 is an apocalyptic number.

83117157987 is a deficient number, since it is larger than the sum of its proper divisors (30118834077).

83117157987 is a wasteful number, since it uses less digits than its factorization.

83117157987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5739.

The product of its digits is 2963520, while the sum is 57.

The spelling of 83117157987 in words is "eighty-three billion, one hundred seventeen million, one hundred fifty-seven thousand, nine hundred eighty-seven".