85311566809 has 4 divisors (see below), whose sum is σ = 97498933504. Its totient is φ = 73124200116.

The previous prime is 85311566783. The next prime is 85311566831. The reversal of 85311566809 is 90866511358.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85311566809 - 2²³ = 85303178201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85311566839) 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, 6093683337 + ... + 6093683350.

It is an arithmetic number, because the mean of its divisors is an integer number (24374733376).

Almost surely, 2^85311566809 is an apocalyptic number.

It is an amenable number.

85311566809 is a deficient number, since it is larger than the sum of its proper divisors (12187366695).

85311566809 is a wasteful number, since it uses less digits than its factorization.

85311566809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12187366694.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 85311566809 in words is "eighty-five billion, three hundred eleven million, five hundred sixty-six thousand, eight hundred nine".