85869511261 has 2 divisors, whose sum is σ = 85869511262. Its totient is φ = 85869511260.

The previous prime is 85869511213. The next prime is 85869511271. The reversal of 85869511261 is 16211596858.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85869511225 + 36 = 293035^2 + 6^2 .

It is a cyclic number.

It is not a de Polignac number, because 85869511261 - 2²⁷ = 85735293533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85869511199 and 85869511208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85869511271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42934755630 + 42934755631.

It is an arithmetic number, because the mean of its divisors is an integer number (42934755631).

Almost surely, 2^85869511261 is an apocalyptic number.

It is an amenable number.

85869511261 is a deficient number, since it is larger than the sum of its proper divisors (1).

85869511261 is an equidigital number, since it uses as much as digits as its factorization.

85869511261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1036800, while the sum is 52.

The spelling of 85869511261 in words is "eighty-five billion, eight hundred sixty-nine million, five hundred eleven thousand, two hundred sixty-one".