85765510261 has 2 divisors, whose sum is σ = 85765510262. Its totient is φ = 85765510260.

The previous prime is 85765510211. The next prime is 85765510279. The reversal of 85765510261 is 16201556758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76241702161 + 9523808100 = 276119^2 + 97590^2 .

It is a cyclic number.

It is not a de Polignac number, because 85765510261 - 2⁷ = 85765510133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85765510211) 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, 42882755130 + 42882755131.

It is an arithmetic number, because the mean of its divisors is an integer number (42882755131).

Almost surely, 2^85765510261 is an apocalyptic number.

It is an amenable number.

85765510261 is a deficient number, since it is larger than the sum of its proper divisors (1).

85765510261 is an equidigital number, since it uses as much as digits as its factorization.

85765510261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504000, while the sum is 46.

The spelling of 85765510261 in words is "eighty-five billion, seven hundred sixty-five million, five hundred ten thousand, two hundred sixty-one".