2166146565 has 16 divisors (see below), whose sum is σ = 3780910656. Its totient is φ = 1050252800.

The previous prime is 2166146557. The next prime is 2166146569. The reversal of 2166146565 is 5656416612.

It is not a de Polignac number, because 2166146565 - 2³ = 2166146557 is a prime.

It is a super-2 number, since 2×2166146565² = 9384381882122598450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166146569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6563916 + ... + 6564245.

It is an arithmetic number, because the mean of its divisors is an integer number (236306916).

Almost surely, 2^2166146565 is an apocalyptic number.

It is an amenable number.

2166146565 is a deficient number, since it is larger than the sum of its proper divisors (1614764091).

2166146565 is a wasteful number, since it uses less digits than its factorization.

2166146565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13128180.

The product of its digits is 259200, while the sum is 42.

The square root of 2166146565 is about 46541.8796891574. The cubic root of 2166146565 is about 1293.8857984365.

The spelling of 2166146565 in words is "two billion, one hundred sixty-six million, one hundred forty-six thousand, five hundred sixty-five".