2165755969 has 16 divisors (see below), whose sum is σ = 2437972992. Its totient is φ = 1908929088.

The previous prime is 2165755951. The next prime is 2165755979. The reversal of 2165755969 is 9695575612.

It is a cyclic number.

It is not a de Polignac number, because 2165755969 - 2⁵ = 2165755937 is a prime.

It is a super-4 number, since 4×2165755969⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2165755909) 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, 175527 + ... + 187459.

It is an arithmetic number, because the mean of its divisors is an integer number (152373312).

Almost surely, 2^2165755969 is an apocalyptic number.

It is an amenable number.

2165755969 is a deficient number, since it is larger than the sum of its proper divisors (272217023).

2165755969 is a wasteful number, since it uses less digits than its factorization.

2165755969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12576.

The product of its digits is 5103000, while the sum is 55.

The square root of 2165755969 is about 46537.6833222282. The cubic root of 2165755969 is about 1293.8080233057.

The spelling of 2165755969 in words is "two billion, one hundred sixty-five million, seven hundred fifty-five thousand, nine hundred sixty-nine".