2166768765 has 32 divisors (see below), whose sum is σ = 4402325760. Its totient is φ = 990522432.

The previous prime is 2166768731. The next prime is 2166768767. The reversal of 2166768765 is 5678676612.

It is not a de Polignac number, because 2166768765 - 2⁸ = 2166768509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166768767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1145494 + ... + 1147383.

It is an arithmetic number, because the mean of its divisors is an integer number (137572680).

Almost surely, 2^2166768765 is an apocalyptic number.

It is an amenable number.

2166768765 is an abundant number, since it is smaller than the sum of its proper divisors (2235556995).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166768765 is a wasteful number, since it uses less digits than its factorization.

2166768765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2292898 (or 2292892 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The square root of 2166768765 is about 46548.5635116703. The cubic root of 2166768765 is about 1294.0096710448.

The spelling of 2166768765 in words is "two billion, one hundred sixty-six million, seven hundred sixty-eight thousand, seven hundred sixty-five".