86186922181 has 4 divisors (see below), whose sum is σ = 90723076000. Its totient is φ = 81650768364.

The previous prime is 86186922127. The next prime is 86186922197. The reversal of 86186922181 is 18122968168.

It is a happy number.

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 86186922181 - 2⁹ = 86186921669 is a prime.

It is a super-2 number, since 2×86186922181² (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 (86186922581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2268076881 + ... + 2268076918.

It is an arithmetic number, because the mean of its divisors is an integer number (22680769000).

Almost surely, 2^86186922181 is an apocalyptic number.

It is an amenable number.

86186922181 is a deficient number, since it is larger than the sum of its proper divisors (4536153819).

86186922181 is a wasteful number, since it uses less digits than its factorization.

86186922181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536153818.

The product of its digits is 663552, while the sum is 52.

The spelling of 86186922181 in words is "eighty-six billion, one hundred eighty-six million, nine hundred twenty-two thousand, one hundred eighty-one".