261206713117 has 16 divisors (see below), whose sum is σ = 315041500800. Its totient is φ = 211562400960.

The previous prime is 261206713109. The next prime is 261206713133. The reversal of 261206713117 is 711317602162.

It is a cyclic number.

It is not a de Polignac number, because 261206713117 - 2³ = 261206713109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261206716117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2472634 + ... + 2576107.

It is an arithmetic number, because the mean of its divisors is an integer number (19690093800).

Almost surely, 2^261206713117 is an apocalyptic number.

It is an amenable number.

261206713117 is a deficient number, since it is larger than the sum of its proper divisors (53834787683).

261206713117 is a wasteful number, since it uses less digits than its factorization.

261206713117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5049156.

The product of its (nonzero) digits is 21168, while the sum is 37.

The spelling of 261206713117 in words is "two hundred sixty-one billion, two hundred six million, seven hundred thirteen thousand, one hundred seventeen".