85809665879 has 8 divisors (see below), whose sum is σ = 100069581600. Its totient is φ = 73551141888.

The previous prime is 85809665867. The next prime is 85809665881. The reversal of 85809665879 is 97856690858.

It is not a de Polignac number, because 85809665879 - 2¹² = 85809661783 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 (85809665899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125086634 + ... + 125087319.

It is an arithmetic number, because the mean of its divisors is an integer number (12508697700).

Almost surely, 2^85809665879 is an apocalyptic number.

85809665879 is a deficient number, since it is larger than the sum of its proper divisors (14259915721).

85809665879 is an equidigital number, since it uses as much as digits as its factorization.

85809665879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250173974 (or 250173960 counting only the distinct ones).

The product of its (nonzero) digits is 261273600, while the sum is 71.

The spelling of 85809665879 in words is "eighty-five billion, eight hundred nine million, six hundred sixty-five thousand, eight hundred seventy-nine".