646499863 has 2 divisors, whose sum is σ = 646499864. Its totient is φ = 646499862.

The previous prime is 646499831. The next prime is 646499873. The reversal of 646499863 is 368994646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646499863 - 2⁵ = 646499831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646499873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323249931 + 323249932.

It is an arithmetic number, because the mean of its divisors is an integer number (323249932).

Almost surely, 2^646499863 is an apocalyptic number.

646499863 is a deficient number, since it is larger than the sum of its proper divisors (1).

646499863 is an equidigital number, since it uses as much as digits as its factorization.

646499863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 55.

The square root of 646499863 is about 25426.3615761280. The cubic root of 646499863 is about 864.6814571013.

The spelling of 646499863 in words is "six hundred forty-six million, four hundred ninety-nine thousand, eight hundred sixty-three".