868686899 has 2 divisors, whose sum is σ = 868686900. Its totient is φ = 868686898.

The previous prime is 868686877. The next prime is 868686901. The reversal of 868686899 is 998686868.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-868686899 is a prime.

Together with 868686901, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (868686869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434343449 + 434343450.

It is an arithmetic number, because the mean of its divisors is an integer number (434343450).

Almost surely, 2^868686899 is an apocalyptic number.

868686899 is a deficient number, since it is larger than the sum of its proper divisors (1).

868686899 is an equidigital number, since it uses as much as digits as its factorization.

868686899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71663616, while the sum is 68.

The square root of 868686899 is about 29473.4948555478. The cubic root of 868686899 is about 954.1597459229.

The spelling of 868686899 in words is "eight hundred sixty-eight million, six hundred eighty-six thousand, eight hundred ninety-nine".