6645380839 has 2 divisors, whose sum is σ = 6645380840. Its totient is φ = 6645380838.

The previous prime is 6645380831. The next prime is 6645380843. The reversal of 6645380839 is 9380835466.

6645380839 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6645380839 - 2³ = 6645380831 is a prime.

It is a super-2 number, since 2×6645380839² = 88322172990696687842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6645380831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322690419 + 3322690420.

It is an arithmetic number, because the mean of its divisors is an integer number (3322690420).

Almost surely, 2^6645380839 is an apocalyptic number.

6645380839 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645380839 is an equidigital number, since it uses as much as digits as its factorization.

6645380839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3732480, while the sum is 52.

The square root of 6645380839 is about 81519.2053383741. The cubic root of 6645380839 is about 1880.0668490452.

The spelling of 6645380839 in words is "six billion, six hundred forty-five million, three hundred eighty thousand, eight hundred thirty-nine".