6645366043 has 2 divisors, whose sum is σ = 6645366044. Its totient is φ = 6645366042.

The previous prime is 6645366041. The next prime is 6645366083. The reversal of 6645366043 is 3406635466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6645366043 - 2¹ = 6645366041 is a prime.

Together with 6645366041, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6645366041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322683021 + 3322683022.

It is an arithmetic number, because the mean of its divisors is an integer number (3322683022).

Almost surely, 2^6645366043 is an apocalyptic number.

6645366043 is a deficient number, since it is larger than the sum of its proper divisors (1).

6645366043 is an equidigital number, since it uses as much as digits as its factorization.

6645366043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 43.

The square root of 6645366043 is about 81519.1145867029. The cubic root of 6645366043 is about 1880.0654537156.

It can be divided in two parts, 66453 and 66043, that added together give a square (132496 = 364²).

The spelling of 6645366043 in words is "six billion, six hundred forty-five million, three hundred sixty-six thousand, forty-three".