6643427099 has 2 divisors, whose sum is σ = 6643427100. Its totient is φ = 6643427098.

The previous prime is 6643427057. The next prime is 6643427113. The reversal of 6643427099 is 9907243466.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6643427099 is a prime.

It is not a weakly prime, because it can be changed into another prime (6643427599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321713549 + 3321713550.

It is an arithmetic number, because the mean of its divisors is an integer number (3321713550).

Almost surely, 2^6643427099 is an apocalyptic number.

6643427099 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643427099 is an equidigital number, since it uses as much as digits as its factorization.

6643427099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 50.

The square root of 6643427099 is about 81507.2211463500. The cubic root of 6643427099 is about 1879.8825846203.

The spelling of 6643427099 in words is "six billion, six hundred forty-three million, four hundred twenty-seven thousand, ninety-nine".