261095907189 has 16 divisors (see below), whose sum is σ = 387000717824. Its totient is φ = 155491358400.

The previous prime is 261095907179. The next prime is 261095907197. The reversal of 261095907189 is 981709590162.

It is not a de Polignac number, because 261095907189 - 2²⁰ = 261094858613 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 (261095907179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107978902 + ... + 107981319.

It is an arithmetic number, because the mean of its divisors is an integer number (24187544864).

Almost surely, 2^261095907189 is an apocalyptic number.

It is an amenable number.

261095907189 is a deficient number, since it is larger than the sum of its proper divisors (125904810635).

261095907189 is a wasteful number, since it uses less digits than its factorization.

261095907189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215960268.

The product of its (nonzero) digits is 2449440, while the sum is 57.

The spelling of 261095907189 in words is "two hundred sixty-one billion, ninety-five million, nine hundred seven thousand, one hundred eighty-nine".