85639692169 has 4 divisors (see below), whose sum is σ = 85830426900. Its totient is φ = 85448957440.

The previous prime is 85639692071. The next prime is 85639692179. The reversal of 85639692169 is 96129693658.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96129693658 = 2 ⋅48064846829.

It can be written as a sum of positive squares in 2 ways, for example, as 53370240400 + 32269451769 = 231020^2 + 179637^2 .

It is a cyclic number.

It is not a de Polignac number, because 85639692169 - 2¹¹ = 85639690121 is a prime.

It is a super-2 number, since 2×85639692169² (a number of 23 digits) contains 22 as substring.

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 85639692169.

It is not an unprimeable number, because it can be changed into a prime (85639692179) 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, 95366692 + ... + 95367589.

It is an arithmetic number, because the mean of its divisors is an integer number (21457606725).

Almost surely, 2^85639692169 is an apocalyptic number.

It is an amenable number.

85639692169 is a deficient number, since it is larger than the sum of its proper divisors (190734731).

85639692169 is a wasteful number, since it uses less digits than its factorization.

85639692169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190734730.

The product of its digits is 37791360, while the sum is 64.

The spelling of 85639692169 in words is "eighty-five billion, six hundred thirty-nine million, six hundred ninety-two thousand, one hundred sixty-nine".