86173572197 has 4 divisors (see below), whose sum is σ = 86242567500. Its totient is φ = 86104576896.

The previous prime is 86173572139. The next prime is 86173572217. The reversal of 86173572197 is 79127537168.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 38730633601 + 47442938596 = 196801^2 + 217814^2 .

It is a cyclic number.

It is not a de Polignac number, because 86173572197 - 2¹⁰ = 86173571173 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 (86173572997) 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, 34495778 + ... + 34498275.

It is an arithmetic number, because the mean of its divisors is an integer number (21560641875).

Almost surely, 2^86173572197 is an apocalyptic number.

It is an amenable number.

86173572197 is a deficient number, since it is larger than the sum of its proper divisors (68995303).

86173572197 is a wasteful number, since it uses less digits than its factorization.

86173572197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68995302.

The product of its digits is 4445280, while the sum is 56.

The spelling of 86173572197 in words is "eighty-six billion, one hundred seventy-three million, five hundred seventy-two thousand, one hundred ninety-seven".