259799959421 has 2 divisors, whose sum is σ = 259799959422. Its totient is φ = 259799959420.

The previous prime is 259799959313. The next prime is 259799959423. The reversal of 259799959421 is 124959997952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255232092025 + 4567867396 = 505205^2 + 67586^2 .

It is a cyclic number.

It is not a de Polignac number, because 259799959421 - 2¹⁴ = 259799943037 is a prime.

It is a Sophie Germain prime.

Together with 259799959423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259799959423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129899979710 + 129899979711.

It is an arithmetic number, because the mean of its divisors is an integer number (129899979711).

Almost surely, 2^259799959421 is an apocalyptic number.

It is an amenable number.

259799959421 is a deficient number, since it is larger than the sum of its proper divisors (1).

259799959421 is an equidigital number, since it uses as much as digits as its factorization.

259799959421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165337200, while the sum is 71.

The spelling of 259799959421 in words is "two hundred fifty-nine billion, seven hundred ninety-nine million, nine hundred fifty-nine thousand, four hundred twenty-one".