6499878919 has 2 divisors, whose sum is σ = 6499878920. Its totient is φ = 6499878918.

The previous prime is 6499878899. The next prime is 6499878947. The reversal of 6499878919 is 9198789946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6499878919 - 2⁵ = 6499878887 is a prime.

It is a super-2 number, since 2×6499878919² = 84496851923321217122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6499878419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3249939459 + 3249939460.

It is an arithmetic number, because the mean of its divisors is an integer number (3249939460).

Almost surely, 2^6499878919 is an apocalyptic number.

6499878919 is a deficient number, since it is larger than the sum of its proper divisors (1).

6499878919 is an equidigital number, since it uses as much as digits as its factorization.

6499878919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70543872, while the sum is 70.

The square root of 6499878919 is about 80621.8265670036. The cubic root of 6499878919 is about 1866.2439902294.

The spelling of 6499878919 in words is "six billion, four hundred ninety-nine million, eight hundred seventy-eight thousand, nine hundred nineteen".