6564109356443 has 2 divisors, whose sum is σ = 6564109356444. Its totient is φ = 6564109356442.

The previous prime is 6564109356421. The next prime is 6564109356559. The reversal of 6564109356443 is 3446539014656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6564109356443 - 2²⁴ = 6564092579227 is a prime.

It is a super-2 number, since 2×6564109356443² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6564109356643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3282054678221 + 3282054678222.

It is an arithmetic number, because the mean of its divisors is an integer number (3282054678222).

Almost surely, 2^{6564109356443} is an apocalyptic number.

6564109356443 is a deficient number, since it is larger than the sum of its proper divisors (1).

6564109356443 is an equidigital number, since it uses as much as digits as its factorization.

6564109356443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27993600, while the sum is 56.

The spelling of 6564109356443 in words is "six trillion, five hundred sixty-four billion, one hundred nine million, three hundred fifty-six thousand, four hundred forty-three".