261340105101 has 16 divisors (see below), whose sum is σ = 359772338688. Its totient is φ = 168569755200.

The previous prime is 261340105097. The next prime is 261340105151. The reversal of 261340105101 is 101501043162.

It is a happy number.

261340105101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261340105101 - 2² = 261340105097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261340105151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125695 + ... + 733811.

It is an arithmetic number, because the mean of its divisors is an integer number (22485771168).

Almost surely, 2^261340105101 is an apocalyptic number.

It is an amenable number.

261340105101 is a deficient number, since it is larger than the sum of its proper divisors (98432233587).

261340105101 is a wasteful number, since it uses less digits than its factorization.

261340105101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612772.

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 261340105101 its reverse (101501043162), we get a palindrome (362841148263).

The spelling of 261340105101 in words is "two hundred sixty-one billion, three hundred forty million, one hundred five thousand, one hundred one".