2665766771 has 2 divisors, whose sum is σ = 2665766772. Its totient is φ = 2665766770.

The previous prime is 2665766743. The next prime is 2665766801. The reversal of 2665766771 is 1776675662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2665766771 - 2¹⁴ = 2665750387 is a prime.

It is not a weakly prime, because it can be changed into another prime (2665766731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332883385 + 1332883386.

It is an arithmetic number, because the mean of its divisors is an integer number (1332883386).

Almost surely, 2^2665766771 is an apocalyptic number.

2665766771 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665766771 is an equidigital number, since it uses as much as digits as its factorization.

2665766771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4445280, while the sum is 53.

The square root of 2665766771 is about 51631.0640118911. The cubic root of 2665766771 is about 1386.5665429498.

The spelling of 2665766771 in words is "two billion, six hundred sixty-five million, seven hundred sixty-six thousand, seven hundred seventy-one".