800000008861 has 2 divisors, whose sum is σ = 800000008862. Its totient is φ = 800000008860.

The previous prime is 800000008849. The next prime is 800000008883. The reversal of 800000008861 is 168800000008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 415903748836 + 384096260025 = 644906^2 + 619755^2 .

It is a cyclic number.

It is not a de Polignac number, because 800000008861 - 2⁷ = 800000008733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (800000018861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400000004430 + 400000004431.

It is an arithmetic number, because the mean of its divisors is an integer number (400000004431).

Almost surely, 2^800000008861 is an apocalyptic number.

It is an amenable number.

800000008861 is a deficient number, since it is larger than the sum of its proper divisors (1).

800000008861 is an equidigital number, since it uses as much as digits as its factorization.

800000008861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 31.

Adding to 800000008861 its reverse (168800000008), we get a palindrome (968800008869).

The spelling of 800000008861 in words is "eight hundred billion, eight thousand, eight hundred sixty-one".