863440887109 has 2 divisors, whose sum is σ = 863440887110. Its totient is φ = 863440887108.

The previous prime is 863440887083. The next prime is 863440887181. The reversal of 863440887109 is 901788044368.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 433124566884 + 430316320225 = 658122^2 + 655985^2 .

It is a cyclic number.

It is not a de Polignac number, because 863440887109 - 2⁹ = 863440886597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (863440887509) 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, 431720443554 + 431720443555.

It is an arithmetic number, because the mean of its divisors is an integer number (431720443555).

Almost surely, 2^863440887109 is an apocalyptic number.

It is an amenable number.

863440887109 is a deficient number, since it is larger than the sum of its proper divisors (1).

863440887109 is an equidigital number, since it uses as much as digits as its factorization.

863440887109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9289728, while the sum is 58.

The spelling of 863440887109 in words is "eight hundred sixty-three billion, four hundred forty million, eight hundred eighty-seven thousand, one hundred nine".