686787863 has 2 divisors, whose sum is σ = 686787864. Its totient is φ = 686787862.

The previous prime is 686787847. The next prime is 686787877. The reversal of 686787863 is 368787686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686787863 - 2⁴ = 686787847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686787823) 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, 343393931 + 343393932.

It is an arithmetic number, because the mean of its divisors is an integer number (343393932).

Almost surely, 2^686787863 is an apocalyptic number.

686787863 is a deficient number, since it is larger than the sum of its proper divisors (1).

686787863 is an equidigital number, since it uses as much as digits as its factorization.

686787863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 59.

The square root of 686787863 is about 26206.6377660317. The cubic root of 686787863 is about 882.2822401668.

The spelling of 686787863 in words is "six hundred eighty-six million, seven hundred eighty-seven thousand, eight hundred sixty-three".