259925478409 has 2 divisors, whose sum is σ = 259925478410. Its totient is φ = 259925478408.

The previous prime is 259925478301. The next prime is 259925478473. The reversal of 259925478409 is 904874529952.

It is a happy number.

It is an a-pointer prime, because the next prime (259925478473) can be obtained adding 259925478409 to its sum of digits (64).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256988163600 + 2937314809 = 506940^2 + 54197^2 .

It is a cyclic number.

It is not a de Polignac number, because 259925478409 - 2¹⁵ = 259925445641 is a prime.

It is a super-2 number, since 2×259925478409² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (259925478809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129962739204 + 129962739205.

It is an arithmetic number, because the mean of its divisors is an integer number (129962739205).

Almost surely, 2^259925478409 is an apocalyptic number.

It is an amenable number.

259925478409 is a deficient number, since it is larger than the sum of its proper divisors (1).

259925478409 is an equidigital number, since it uses as much as digits as its factorization.

259925478409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65318400, while the sum is 64.

The spelling of 259925478409 in words is "two hundred fifty-nine billion, nine hundred twenty-five million, four hundred seventy-eight thousand, four hundred nine".