85171167791 has 4 divisors (see below), whose sum is σ = 85208024784. Its totient is φ = 85134310800.

The previous prime is 85171167787. The next prime is 85171167803. The reversal of 85171167791 is 19776117158.

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

It is a cyclic number.

It is not a de Polignac number, because 85171167791 - 2² = 85171167787 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 (85171161791) 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 3 ways as a sum of consecutive naturals, for example, 18425030 + ... + 18429651.

It is an arithmetic number, because the mean of its divisors is an integer number (21302006196).

Almost surely, 2^85171167791 is an apocalyptic number.

85171167791 is a deficient number, since it is larger than the sum of its proper divisors (36856993).

85171167791 is a wasteful number, since it uses less digits than its factorization.

85171167791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36856992.

The product of its digits is 740880, while the sum is 53.

The spelling of 85171167791 in words is "eighty-five billion, one hundred seventy-one million, one hundred sixty-seven thousand, seven hundred ninety-one".