2166765774 has 16 divisors (see below), whose sum is σ = 4343544912. Its totient is φ = 720586368.

The previous prime is 2166765763. The next prime is 2166765781. The reversal of 2166765774 is 4775676612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 414409 + ... + 419604.

It is an arithmetic number, because the mean of its divisors is an integer number (271471557).

Almost surely, 2^2166765774 is an apocalyptic number.

2166765774 is an abundant number, since it is smaller than the sum of its proper divisors (2176779138).

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

2166765774 is a wasteful number, since it uses less digits than its factorization.

2166765774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834451.

The product of its digits is 2963520, while the sum is 51.

The square root of 2166765774 is about 46548.5313839223. The cubic root of 2166765774 is about 1294.0090756291.

The spelling of 2166765774 in words is "two billion, one hundred sixty-six million, seven hundred sixty-five thousand, seven hundred seventy-four".