85870729169 has 4 divisors (see below), whose sum is σ = 85892056944. Its totient is φ = 85849401396.

The previous prime is 85870729163. The next prime is 85870729181. The reversal of 85870729169 is 96192707858.

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 85870729169 - 2¹⁶ = 85870663633 is a prime.

It is a super-2 number, since 2×85870729169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85870729163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10657847 + ... + 10665900.

It is an arithmetic number, because the mean of its divisors is an integer number (21473014236).

Almost surely, 2^85870729169 is an apocalyptic number.

It is an amenable number.

85870729169 is a deficient number, since it is larger than the sum of its proper divisors (21327775).

85870729169 is a wasteful number, since it uses less digits than its factorization.

85870729169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21327774.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 85870729169 in words is "eighty-five billion, eight hundred seventy million, seven hundred twenty-nine thousand, one hundred sixty-nine".