6399395887 has 2 divisors, whose sum is σ = 6399395888. Its totient is φ = 6399395886.

The previous prime is 6399395843. The next prime is 6399395911. The reversal of 6399395887 is 7885939936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6399395887 - 2¹¹ = 6399393839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6399395687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3199697943 + 3199697944.

It is an arithmetic number, because the mean of its divisors is an integer number (3199697944).

Almost surely, 2^6399395887 is an apocalyptic number.

6399395887 is a deficient number, since it is larger than the sum of its proper divisors (1).

6399395887 is an equidigital number, since it uses as much as digits as its factorization.

6399395887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88179840, while the sum is 67.

The square root of 6399395887 is about 79996.2242046461. The cubic root of 6399395887 is about 1856.5771140204.

The spelling of 6399395887 in words is "six billion, three hundred ninety-nine million, three hundred ninety-five thousand, eight hundred eighty-seven".