819866863 has 2 divisors, whose sum is σ = 819866864. Its totient is φ = 819866862.

The previous prime is 819866851. The next prime is 819866909. The reversal of 819866863 is 368668918.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 819866863 - 2⁹ = 819866351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819861863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409933431 + 409933432.

It is an arithmetic number, because the mean of its divisors is an integer number (409933432).

Almost surely, 2^819866863 is an apocalyptic number.

819866863 is a deficient number, since it is larger than the sum of its proper divisors (1).

819866863 is an equidigital number, since it uses as much as digits as its factorization.

819866863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 55.

The square root of 819866863 is about 28633.3173593281. The cubic root of 819866863 is about 935.9395030998.

The spelling of 819866863 in words is "eight hundred nineteen million, eight hundred sixty-six thousand, eight hundred sixty-three".