2165637689 has 4 divisors (see below), whose sum is σ = 2279618640. Its totient is φ = 2051656740.

The previous prime is 2165637679. The next prime is 2165637751. The reversal of 2165637689 is 9867365612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2165637689 - 2²⁰ = 2164589113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2165637689.

It is not an unprimeable number, because it can be changed into a prime (2165637629) 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, 56990447 + ... + 56990484.

It is an arithmetic number, because the mean of its divisors is an integer number (569904660).

Almost surely, 2^2165637689 is an apocalyptic number.

It is an amenable number.

2165637689 is a deficient number, since it is larger than the sum of its proper divisors (113980951).

2165637689 is a wasteful number, since it uses less digits than its factorization.

2165637689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113980950.

The product of its digits is 3265920, while the sum is 53.

The square root of 2165637689 is about 46536.4125067672. The cubic root of 2165637689 is about 1293.7844696519.

The spelling of 2165637689 in words is "two billion, one hundred sixty-five million, six hundred thirty-seven thousand, six hundred eighty-nine".