86794865891 has 2 divisors, whose sum is σ = 86794865892. Its totient is φ = 86794865890.

The previous prime is 86794865881. The next prime is 86794865981. The reversal of 86794865891 is 19856849768.

Together with next prime (86794865981) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86794865891 - 2²² = 86790671587 is a prime.

It is not a weakly prime, because it can be changed into another prime (86794865821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43397432945 + 43397432946.

It is an arithmetic number, because the mean of its divisors is an integer number (43397432946).

Almost surely, 2^86794865891 is an apocalyptic number.

86794865891 is a deficient number, since it is larger than the sum of its proper divisors (1).

86794865891 is an equidigital number, since it uses as much as digits as its factorization.

86794865891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209018880, while the sum is 71.

The spelling of 86794865891 in words is "eighty-six billion, seven hundred ninety-four million, eight hundred sixty-five thousand, eight hundred ninety-one".