2665802309 has 2 divisors, whose sum is σ = 2665802310. Its totient is φ = 2665802308.

The previous prime is 2665802303. The next prime is 2665802311. The reversal of 2665802309 is 9032085662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1718517025 + 947285284 = 41455^2 + 30778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2665802309 is a prime.

Together with 2665802311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2665802303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332901154 + 1332901155.

It is an arithmetic number, because the mean of its divisors is an integer number (1332901155).

Almost surely, 2^2665802309 is an apocalyptic number.

It is an amenable number.

2665802309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665802309 is an equidigital number, since it uses as much as digits as its factorization.

2665802309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 2665802309 is about 51631.4081640236. The cubic root of 2665802309 is about 1386.5727044769.

The spelling of 2665802309 in words is "two billion, six hundred sixty-five million, eight hundred two thousand, three hundred nine".