2165205499 has 4 divisors (see below), whose sum is σ = 2165415336. Its totient is φ = 2164995664.

The previous prime is 2165205463. The next prime is 2165205503. The reversal of 2165205499 is 9945025612.

2165205499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2165205499 - 2²⁷ = 2030987771 is a prime.

It is a super-2 number, since 2×2165205499² = 9376229705799678002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165203499) 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, 88594 + ... + 110359.

It is an arithmetic number, because the mean of its divisors is an integer number (541353834).

Almost surely, 2^2165205499 is an apocalyptic number.

2165205499 is a deficient number, since it is larger than the sum of its proper divisors (209837).

2165205499 is a wasteful number, since it uses less digits than its factorization.

2165205499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209836.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 2165205499 is about 46531.7687069813. The cubic root of 2165205499 is about 1293.6983983277.

The spelling of 2165205499 in words is "two billion, one hundred sixty-five million, two hundred five thousand, four hundred ninety-nine".