85861256965 has 12 divisors (see below), whose sum is σ = 113251708332. Its totient is φ = 62444550080.

The previous prime is 85861256893. The next prime is 85861256969. The reversal of 85861256965 is 56965216858.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 56888451169 + 28972805796 = 238513^2 + 170214^2 .

It is a de Polignac number, because none of the positive numbers 2^k-85861256965 is a prime.

It is a super-2 number, since 2×85861256965² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85861256969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70959112 + ... + 70960321.

It is an arithmetic number, because the mean of its divisors is an integer number (9437642361).

Almost surely, 2^85861256965 is an apocalyptic number.

It is an amenable number.

85861256965 is a deficient number, since it is larger than the sum of its proper divisors (27390451367).

85861256965 is a wasteful number, since it uses less digits than its factorization.

85861256965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141919460 (or 141919449 counting only the distinct ones).

The product of its digits is 31104000, while the sum is 61.

The spelling of 85861256965 in words is "eighty-five billion, eight hundred sixty-one million, two hundred fifty-six thousand, nine hundred sixty-five".