259666643 has 2 divisors, whose sum is σ = 259666644. Its totient is φ = 259666642.

The previous prime is 259666577. The next prime is 259666669. The reversal of 259666643 is 346666952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 259666643 - 2²⁰ = 258618067 is a prime.

It is not a weakly prime, because it can be changed into another prime (259662643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129833321 + 129833322.

It is an arithmetic number, because the mean of its divisors is an integer number (129833322).

Almost surely, 2^259666643 is an apocalyptic number.

259666643 is a deficient number, since it is larger than the sum of its proper divisors (1).

259666643 is an equidigital number, since it uses as much as digits as its factorization.

259666643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 47.

The square root of 259666643 is about 16114.1752193527. The cubic root of 259666643 is about 637.9775372640.

The spelling of 259666643 in words is "two hundred fifty-nine million, six hundred sixty-six thousand, six hundred forty-three".