8861968813 has 2 divisors, whose sum is σ = 8861968814. Its totient is φ = 8861968812.

The previous prime is 8861968789. The next prime is 8861968867. The reversal of 8861968813 is 3188691688.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6084468009 + 2777500804 = 78003^2 + 52702^2 .

It is a cyclic number.

It is not a de Polignac number, because 8861968813 - 2⁵ = 8861968781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8861965813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4430984406 + 4430984407.

It is an arithmetic number, because the mean of its divisors is an integer number (4430984407).

Almost surely, 2^8861968813 is an apocalyptic number.

It is an amenable number.

8861968813 is a deficient number, since it is larger than the sum of its proper divisors (1).

8861968813 is an equidigital number, since it uses as much as digits as its factorization.

8861968813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3981312, while the sum is 58.

The square root of 8861968813 is about 94138.0306411814. The cubic root of 8861968813 is about 2069.3950493265.

The spelling of 8861968813 in words is "eight billion, eight hundred sixty-one million, nine hundred sixty-eight thousand, eight hundred thirteen".