86564885809 has 2 divisors, whose sum is σ = 86564885810. Its totient is φ = 86564885808.

The previous prime is 86564885789. The next prime is 86564885821. The reversal of 86564885809 is 90858846568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86537165584 + 27720225 = 294172^2 + 5265^2 .

It is a cyclic number.

It is not a de Polignac number, because 86564885809 - 2³¹ = 84417402161 is a prime.

It is a super-3 number, since 3×86564885809³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (86564885879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43282442904 + 43282442905.

It is an arithmetic number, because the mean of its divisors is an integer number (43282442905).

Almost surely, 2^86564885809 is an apocalyptic number.

It is an amenable number.

86564885809 is a deficient number, since it is larger than the sum of its proper divisors (1).

86564885809 is an equidigital number, since it uses as much as digits as its factorization.

86564885809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 132710400, while the sum is 67.

The spelling of 86564885809 in words is "eighty-six billion, five hundred sixty-four million, eight hundred eighty-five thousand, eight hundred nine".