117816894987 has 16 divisors (see below), whose sum is σ = 172786316160. Its totient is φ = 71404176360.

The previous prime is 117816894961. The next prime is 117816894989. The reversal of 117816894987 is 789498618711.

It is not a de Polignac number, because 117816894987 - 2⁷ = 117816894859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117816894989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14748937 + ... + 14756922.

It is an arithmetic number, because the mean of its divisors is an integer number (10799144760).

Almost surely, 2^117816894987 is an apocalyptic number.

117816894987 is a deficient number, since it is larger than the sum of its proper divisors (54969421173).

117816894987 is an equidigital number, since it uses as much as digits as its factorization.

117816894987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29505895 (or 29505873 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 69.

The spelling of 117816894987 in words is "one hundred seventeen billion, eight hundred sixteen million, eight hundred ninety-four thousand, nine hundred eighty-seven".