2566765361 has 2 divisors, whose sum is σ = 2566765362. Its totient is φ = 2566765360.

The previous prime is 2566765351. The next prime is 2566765387. The reversal of 2566765361 is 1635676652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1887381136 + 679384225 = 43444^2 + 26065^2 .

It is a cyclic number.

It is not a de Polignac number, because 2566765361 - 2⁶ = 2566765297 is a prime.

It is not a weakly prime, because it can be changed into another prime (2566765301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1283382680 + 1283382681.

It is an arithmetic number, because the mean of its divisors is an integer number (1283382681).

Almost surely, 2^2566765361 is an apocalyptic number.

It is an amenable number.

2566765361 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566765361 is an equidigital number, since it uses as much as digits as its factorization.

2566765361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 47.

The square root of 2566765361 is about 50663.2545440973. The cubic root of 2566765361 is about 1369.1847603266.

The spelling of 2566765361 in words is "two billion, five hundred sixty-six million, seven hundred sixty-five thousand, three hundred sixty-one".