261535123241611 has 2 divisors, whose sum is σ = 261535123241612. Its totient is φ = 261535123241610.

The previous prime is 261535123241549. The next prime is 261535123241647. The reversal of 261535123241611 is 116142321535162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261535123241611 - 2⁹ = 261535123241099 is a prime.

It is not a weakly prime, because it can be changed into another prime (261535123241681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130767561620805 + 130767561620806.

It is an arithmetic number, because the mean of its divisors is an integer number (130767561620806).

Almost surely, 2^{261535123241611} is an apocalyptic number.

261535123241611 is a deficient number, since it is larger than the sum of its proper divisors (1).

261535123241611 is an equidigital number, since it uses as much as digits as its factorization.

261535123241611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 43.

Adding to 261535123241611 its reverse (116142321535162), we get a palindrome (377677444776773).

The spelling of 261535123241611 in words is "two hundred sixty-one trillion, five hundred thirty-five billion, one hundred twenty-three million, two hundred forty-one thousand, six hundred eleven".