2665772091 has 24 divisors (see below), whose sum is σ = 4088504160. Its totient is φ = 1667947776.

The previous prime is 2665772063. The next prime is 2665772093. The reversal of 2665772091 is 1902775662.

It is not a de Polignac number, because 2665772091 - 2¹⁸ = 2665509947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2665772093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30661 + ... + 79193.

It is an arithmetic number, because the mean of its divisors is an integer number (170354340).

Almost surely, 2^2665772091 is an apocalyptic number.

2665772091 is a deficient number, since it is larger than the sum of its proper divisors (1422732069).

2665772091 is a wasteful number, since it uses less digits than its factorization.

2665772091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48915 (or 48912 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 2665772091 is about 51631.1155312376. The cubic root of 2665772091 is about 1386.5674653272.

The spelling of 2665772091 in words is "two billion, six hundred sixty-five million, seven hundred seventy-two thousand, ninety-one".