259640663 has 2 divisors, whose sum is σ = 259640664. Its totient is φ = 259640662.

The previous prime is 259640621. The next prime is 259640669. The reversal of 259640663 is 366046952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 259640663 - 2¹² = 259636567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 259640663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259640669) 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, 129820331 + 129820332.

It is an arithmetic number, because the mean of its divisors is an integer number (129820332).

Almost surely, 2^259640663 is an apocalyptic number.

259640663 is a deficient number, since it is larger than the sum of its proper divisors (1).

259640663 is an equidigital number, since it uses as much as digits as its factorization.

259640663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 259640663 is about 16113.3690766394. The cubic root of 259640663 is about 637.9562597149.

The spelling of 259640663 in words is "two hundred fifty-nine million, six hundred forty thousand, six hundred sixty-three".