261136466536613 has 16 divisors (see below), whose sum is σ = 265502610446976. Its totient is φ = 256784504581440.

The previous prime is 261136466536601. The next prime is 261136466536637. The reversal of 261136466536613 is 316635664631162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261136466536613 - 2⁴ = 261136466536597 is a prime.

It is a super-2 number, since 2×261136466536613² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261136466536213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84714320 + ... + 87742742.

It is an arithmetic number, because the mean of its divisors is an integer number (16593913152936).

Almost surely, 2^{261136466536613} is an apocalyptic number.

It is an amenable number.

261136466536613 is a deficient number, since it is larger than the sum of its proper divisors (4366143910363).

261136466536613 is a wasteful number, since it uses less digits than its factorization.

261136466536613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030764.

The product of its digits is 50388480, while the sum is 59.

The spelling of 261136466536613 in words is "two hundred sixty-one trillion, one hundred thirty-six billion, four hundred sixty-six million, five hundred thirty-six thousand, six hundred thirteen".