261344116635 has 16 divisors (see below), whose sum is σ = 477886384896. Its totient is φ = 119471596128.

The previous prime is 261344116613. The next prime is 261344116669. The reversal of 261344116635 is 536611443162.

It is a happy number.

It is not a de Polignac number, because 261344116635 - 2⁷ = 261344116507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1244495689 + ... + 1244495898.

It is an arithmetic number, because the mean of its divisors is an integer number (29867899056).

Almost surely, 2^261344116635 is an apocalyptic number.

261344116635 is a deficient number, since it is larger than the sum of its proper divisors (216542268261).

261344116635 is a wasteful number, since it uses less digits than its factorization.

261344116635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488991602.

The product of its digits is 311040, while the sum is 42.

Adding to 261344116635 its reverse (536611443162), we get a palindrome (797955559797).

The spelling of 261344116635 in words is "two hundred sixty-one billion, three hundred forty-four million, one hundred sixteen thousand, six hundred thirty-five".