85597826821 has 16 divisors (see below), whose sum is σ = 92387055600. Its totient is φ = 78838069248.

The previous prime is 85597826773. The next prime is 85597826833. The reversal of 85597826821 is 12862879558.

It can be written as a sum of positive squares in 8 ways, for example, as 20796524100 + 64801302721 = 144210^2 + 254561^2 .

It is a cyclic number.

It is not a de Polignac number, because 85597826821 - 2³¹ = 83450343173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 85597826821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85597826621) 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 in 15 ways as a sum of consecutive naturals, for example, 12037215 + ... + 12044323.

It is an arithmetic number, because the mean of its divisors is an integer number (5774190975).

Almost surely, 2^85597826821 is an apocalyptic number.

It is an amenable number.

85597826821 is a deficient number, since it is larger than the sum of its proper divisors (6789228779).

85597826821 is a wasteful number, since it uses less digits than its factorization.

85597826821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9048.

The product of its digits is 19353600, while the sum is 61.

The spelling of 85597826821 in words is "eighty-five billion, five hundred ninety-seven million, eight hundred twenty-six thousand, eight hundred twenty-one".