858863368849 has 2 divisors, whose sum is σ = 858863368850. Its totient is φ = 858863368848.

The previous prime is 858863368813. The next prime is 858863368861. The reversal of 858863368849 is 948863368858.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541595908624 + 317267460225 = 735932^2 + 563265^2 .

It is a cyclic number.

It is not a de Polignac number, because 858863368849 - 2²⁵ = 858829814417 is a prime.

It is not a weakly prime, because it can be changed into another prime (858863368049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429431684424 + 429431684425.

It is an arithmetic number, because the mean of its divisors is an integer number (429431684425).

Almost surely, 2^858863368849 is an apocalyptic number.

It is an amenable number.

858863368849 is a deficient number, since it is larger than the sum of its proper divisors (1).

858863368849 is an equidigital number, since it uses as much as digits as its factorization.

858863368849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1911029760, while the sum is 76.

Subtracting 858863368849 from its reverse (948863368858), we obtain a palindrome (90000000009).

The spelling of 858863368849 in words is "eight hundred fifty-eight billion, eight hundred sixty-three million, three hundred sixty-eight thousand, eight hundred forty-nine".