86391667643909 has 2 divisors, whose sum is σ = 86391667643910. Its totient is φ = 86391667643908.

The previous prime is 86391667643899. The next prime is 86391667643921. The reversal of 86391667643909 is 90934676619368.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81368788816225 + 5022878827684 = 9020465^2 + 2241178^2 .

It is a cyclic number.

It is not a de Polignac number, because 86391667643909 - 2¹⁶ = 86391667578373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 86391667643909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86391667643959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43195833821954 + 43195833821955.

It is an arithmetic number, because the mean of its divisors is an integer number (43195833821955).

Almost surely, 2^{86391667643909} is an apocalyptic number.

It is an amenable number.

86391667643909 is a deficient number, since it is larger than the sum of its proper divisors (1).

86391667643909 is an equidigital number, since it uses as much as digits as its factorization.

86391667643909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1904684544, while the sum is 77.

The spelling of 86391667643909 in words is "eighty-six trillion, three hundred ninety-one billion, six hundred sixty-seven million, six hundred forty-three thousand, nine hundred nine".