6641433391 has 2 divisors, whose sum is σ = 6641433392. Its totient is φ = 6641433390.

The previous prime is 6641433373. The next prime is 6641433419. The reversal of 6641433391 is 1933341466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6641433391 - 2⁹ = 6641432879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6641433361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320716695 + 3320716696.

It is an arithmetic number, because the mean of its divisors is an integer number (3320716696).

Almost surely, 2^6641433391 is an apocalyptic number.

6641433391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6641433391 is an equidigital number, since it uses as much as digits as its factorization.

6641433391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 40.

The square root of 6641433391 is about 81494.9899748445. The cubic root of 6641433391 is about 1879.6945134197.

The spelling of 6641433391 in words is "six billion, six hundred forty-one million, four hundred thirty-three thousand, three hundred ninety-one".