6643145287 has 2 divisors, whose sum is σ = 6643145288. Its totient is φ = 6643145286.

The previous prime is 6643145273. The next prime is 6643145303. The reversal of 6643145287 is 7825413466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6643145287 - 2¹¹ = 6643143239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6643145087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321572643 + 3321572644.

It is an arithmetic number, because the mean of its divisors is an integer number (3321572644).

Almost surely, 2^6643145287 is an apocalyptic number.

6643145287 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643145287 is an equidigital number, since it uses as much as digits as its factorization.

6643145287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 967680, while the sum is 46.

The square root of 6643145287 is about 81505.4923732137. The cubic root of 6643145287 is about 1879.8560029101.

The spelling of 6643145287 in words is "six billion, six hundred forty-three million, one hundred forty-five thousand, two hundred eighty-seven".