85811278675861 has 4 divisors (see below), whose sum is σ = 85811358900172. Its totient is φ = 85811198451552.

The previous prime is 85811278675823. The next prime is 85811278675939. The reversal of 85811278675861 is 16857687211858.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81091717948836 + 4719560727025 = 9005094^2 + 2172455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85811278675861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85811278475861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38485710 + ... + 40654303.

It is an arithmetic number, because the mean of its divisors is an integer number (21452839725043).

Almost surely, 2^{85811278675861} is an apocalyptic number.

It is an amenable number.

85811278675861 is a deficient number, since it is larger than the sum of its proper divisors (80224311).

85811278675861 is a wasteful number, since it uses less digits than its factorization.

85811278675861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80224310.

The product of its digits is 361267200, while the sum is 73.

The spelling of 85811278675861 in words is "eighty-five trillion, eight hundred eleven billion, two hundred seventy-eight million, six hundred seventy-five thousand, eight hundred sixty-one".