6647575643 has 2 divisors, whose sum is σ = 6647575644. Its totient is φ = 6647575642.

The previous prime is 6647575573. The next prime is 6647575673. The reversal of 6647575643 is 3465757466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6647575643 - 2¹⁸ = 6647313499 is a prime.

It is not a weakly prime, because it can be changed into another prime (6647575673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323787821 + 3323787822.

It is an arithmetic number, because the mean of its divisors is an integer number (3323787822).

Almost surely, 2^6647575643 is an apocalyptic number.

6647575643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647575643 is an equidigital number, since it uses as much as digits as its factorization.

6647575643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12700800, while the sum is 53.

The square root of 6647575643 is about 81532.6661099709. Note that the first 3 decimals coincide. The cubic root of 6647575643 is about 1880.2738060350.

The spelling of 6647575643 in words is "six billion, six hundred forty-seven million, five hundred seventy-five thousand, six hundred forty-three".