86638518727 has 4 divisors (see below), whose sum is σ = 86695407000. Its totient is φ = 86581630456.

The previous prime is 86638518721. The next prime is 86638518773. The reversal of 86638518727 is 72781583668.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86638518727 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 (86638518721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28441852 + ... + 28444897.

It is an arithmetic number, because the mean of its divisors is an integer number (21673851750).

Almost surely, 2^86638518727 is an apocalyptic number.

86638518727 is a deficient number, since it is larger than the sum of its proper divisors (56888273).

86638518727 is a wasteful number, since it uses less digits than its factorization.

86638518727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56888272.

The product of its digits is 27095040, while the sum is 61.

The spelling of 86638518727 in words is "eighty-six billion, six hundred thirty-eight million, five hundred eighteen thousand, seven hundred twenty-seven".