86111815891 has 4 divisors (see below), whose sum is σ = 86239012752. Its totient is φ = 85984619032.

The previous prime is 86111815873. The next prime is 86111815901. The reversal of 86111815891 is 19851811168.

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-86111815891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86111815871) 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, 63597415 + ... + 63598768.

It is an arithmetic number, because the mean of its divisors is an integer number (21559753188).

Almost surely, 2^86111815891 is an apocalyptic number.

86111815891 is a deficient number, since it is larger than the sum of its proper divisors (127196861).

86111815891 is a wasteful number, since it uses less digits than its factorization.

86111815891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127196860.

The product of its digits is 138240, while the sum is 49.

The spelling of 86111815891 in words is "eighty-six billion, one hundred eleven million, eight hundred fifteen thousand, eight hundred ninety-one".