259621406609 has 2 divisors, whose sum is σ = 259621406610. Its totient is φ = 259621406608.

The previous prime is 259621406587. The next prime is 259621406617. The reversal of 259621406609 is 906604126952.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191802830209 + 67818576400 = 437953^2 + 260420^2 .

It is a cyclic number.

It is not a de Polignac number, because 259621406609 - 2²⁸ = 259352971153 is a prime.

It is not a weakly prime, because it can be changed into another prime (259621406909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129810703304 + 129810703305.

It is an arithmetic number, because the mean of its divisors is an integer number (129810703305).

Almost surely, 2^259621406609 is an apocalyptic number.

It is an amenable number.

259621406609 is a deficient number, since it is larger than the sum of its proper divisors (1).

259621406609 is an equidigital number, since it uses as much as digits as its factorization.

259621406609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 259621406609 in words is "two hundred fifty-nine billion, six hundred twenty-one million, four hundred six thousand, six hundred nine".