85744729173 has 4 divisors (see below), whose sum is σ = 114326305568. Its totient is φ = 57163152780.

The previous prime is 85744729153. The next prime is 85744729199. The reversal of 85744729173 is 37192744758.

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 not a de Polignac number, because 85744729173 - 2⁵ = 85744729141 is a prime.

It is a super-2 number, since 2×85744729173² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85744729153) 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, 14290788193 + ... + 14290788198.

It is an arithmetic number, because the mean of its divisors is an integer number (28581576392).

Almost surely, 2^85744729173 is an apocalyptic number.

It is an amenable number.

85744729173 is a deficient number, since it is larger than the sum of its proper divisors (28581576395).

85744729173 is a wasteful number, since it uses less digits than its factorization.

85744729173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28581576394.

The product of its digits is 11854080, while the sum is 57.

The spelling of 85744729173 in words is "eighty-five billion, seven hundred forty-four million, seven hundred twenty-nine thousand, one hundred seventy-three".