6516643919 has 2 divisors, whose sum is σ = 6516643920. Its totient is φ = 6516643918.

The previous prime is 6516643897. The next prime is 6516643933. The reversal of 6516643919 is 9193466156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6516643919 - 2⁸ = 6516643663 is a prime.

It is a super-2 number, since 2×6516643919² = 84933295934079357122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6516643999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258321959 + 3258321960.

It is an arithmetic number, because the mean of its divisors is an integer number (3258321960).

Almost surely, 2^6516643919 is an apocalyptic number.

6516643919 is a deficient number, since it is larger than the sum of its proper divisors (1).

6516643919 is an equidigital number, since it uses as much as digits as its factorization.

6516643919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 50.

The square root of 6516643919 is about 80725.7326941044. The cubic root of 6516643919 is about 1867.8471338965.

The spelling of 6516643919 in words is "six billion, five hundred sixteen million, six hundred forty-three thousand, nine hundred nineteen".