85172819005 has 8 divisors (see below), whose sum is σ = 102233932632. Its totient is φ = 68120555328.

The previous prime is 85172818963. The next prime is 85172819009. The reversal of 85172819005 is 50091827158.

It can be written as a sum of positive squares in 4 ways, for example, as 40634093241 + 44538725764 = 201579^2 + 211042^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85172819005 - 2¹¹ = 85172816957 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 (85172819009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2191294 + ... + 2229823.

It is an arithmetic number, because the mean of its divisors is an integer number (12779241579).

Almost surely, 2^85172819005 is an apocalyptic number.

It is an amenable number.

85172819005 is a deficient number, since it is larger than the sum of its proper divisors (17061113627).

85172819005 is a wasteful number, since it uses less digits than its factorization.

85172819005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424975.

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 85172819005 in words is "eighty-five billion, one hundred seventy-two million, eight hundred nineteen thousand, five".