2166116999 has 4 divisors (see below), whose sum is σ = 2293535664. Its totient is φ = 2038698336.

The previous prime is 2166116993. The next prime is 2166117013. The reversal of 2166116999 is 9996116612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166116999 - 2¹⁶ = 2166051463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166116993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63709307 + ... + 63709340.

It is an arithmetic number, because the mean of its divisors is an integer number (573383916).

Almost surely, 2^2166116999 is an apocalyptic number.

2166116999 is a deficient number, since it is larger than the sum of its proper divisors (127418665).

2166116999 is a wasteful number, since it uses less digits than its factorization.

2166116999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127418664.

The product of its digits is 314928, while the sum is 50.

The square root of 2166116999 is about 46541.5620601630. The cubic root of 2166116999 is about 1293.8799116078.

The spelling of 2166116999 in words is "two billion, one hundred sixty-six million, one hundred sixteen thousand, nine hundred ninety-nine".