16117659987 has 16 divisors (see below), whose sum is σ = 25247244288. Its totient is φ = 9016872480.

The previous prime is 16117659983. The next prime is 16117659989. The reversal of 16117659987 is 78995671161.

It is not a de Polignac number, because 16117659987 - 2² = 16117659983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16117659987.

It is not an unprimeable number, because it can be changed into a prime (16117659983) 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, 18784723 + ... + 18785580.

It is an arithmetic number, because the mean of its divisors is an integer number (1577952768).

Almost surely, 2^16117659987 is an apocalyptic number.

16117659987 is a deficient number, since it is larger than the sum of its proper divisors (9129584301).

16117659987 is a wasteful number, since it uses less digits than its factorization.

16117659987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37570330.

The product of its digits is 5715360, while the sum is 60.

The spelling of 16117659987 in words is "sixteen billion, one hundred seventeen million, six hundred fifty-nine thousand, nine hundred eighty-seven".