86216821589 has 2 divisors, whose sum is σ = 86216821590. Its totient is φ = 86216821588.

The previous prime is 86216821567. The next prime is 86216821633. The reversal of 86216821589 is 98512861268.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57106660900 + 29110160689 = 238970^2 + 170617^2 .

It is a cyclic number.

It is not a de Polignac number, because 86216821589 - 2²⁰ = 86215773013 is a prime.

It is a super-4 number, since 4×86216821589⁴ (a number of 45 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86216821489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43108410794 + 43108410795.

It is an arithmetic number, because the mean of its divisors is an integer number (43108410795).

Almost surely, 2^86216821589 is an apocalyptic number.

It is an amenable number.

86216821589 is a deficient number, since it is larger than the sum of its proper divisors (1).

86216821589 is an equidigital number, since it uses as much as digits as its factorization.

86216821589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3317760, while the sum is 56.

The spelling of 86216821589 in words is "eighty-six billion, two hundred sixteen million, eight hundred twenty-one thousand, five hundred eighty-nine".