86781418813 has 2 divisors, whose sum is σ = 86781418814. Its totient is φ = 86781418812.

The previous prime is 86781418751. The next prime is 86781418877. The reversal of 86781418813 is 31881418768.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57390430969 + 29390987844 = 239563^2 + 171438^2 .

It is a cyclic number.

It is not a de Polignac number, because 86781418813 - 2¹³ = 86781410621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86781418313) 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, 43390709406 + 43390709407.

It is an arithmetic number, because the mean of its divisors is an integer number (43390709407).

Almost surely, 2^86781418813 is an apocalyptic number.

It is an amenable number.

86781418813 is a deficient number, since it is larger than the sum of its proper divisors (1).

86781418813 is an equidigital number, since it uses as much as digits as its factorization.

86781418813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2064384, while the sum is 55.

The spelling of 86781418813 in words is "eighty-six billion, seven hundred eighty-one million, four hundred eighteen thousand, eight hundred thirteen".