86661863 has 2 divisors, whose sum is σ = 86661864. Its totient is φ = 86661862.

The previous prime is 86661859. The next prime is 86661901. The reversal of 86661863 is 36816668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86661863 - 2² = 86661859 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86661763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43330931 + 43330932.

It is an arithmetic number, because the mean of its divisors is an integer number (43330932).

Almost surely, 2^86661863 is an apocalyptic number.

86661863 is a deficient number, since it is larger than the sum of its proper divisors (1).

86661863 is an equidigital number, since it uses as much as digits as its factorization.

86661863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 44.

The square root of 86661863 is about 9309.2353606513. The cubic root of 86661863 is about 442.5299550939.

The spelling of 86661863 in words is "eighty-six million, six hundred sixty-one thousand, eight hundred sixty-three".