261646343242259 has 2 divisors, whose sum is σ = 261646343242260. Its totient is φ = 261646343242258.

The previous prime is 261646343242237. The next prime is 261646343242309. The reversal of 261646343242259 is 952242343646162.

261646343242259 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261646343242259 - 2⁸ = 261646343242003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261646343242198 and 261646343242207.

It is not a weakly prime, because it can be changed into another prime (261646343242759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130823171621129 + 130823171621130.

It is an arithmetic number, because the mean of its divisors is an integer number (130823171621130).

Almost surely, 2^{261646343242259} is an apocalyptic number.

261646343242259 is a deficient number, since it is larger than the sum of its proper divisors (1).

261646343242259 is an equidigital number, since it uses as much as digits as its factorization.

261646343242259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89579520, while the sum is 59.

The spelling of 261646343242259 in words is "two hundred sixty-one trillion, six hundred forty-six billion, three hundred forty-three million, two hundred forty-two thousand, two hundred fifty-nine".