261096736165 has 32 divisors (see below), whose sum is σ = 322814582496. Its totient is φ = 202582425600.

The previous prime is 261096736151. The next prime is 261096736181. The reversal of 261096736165 is 561637690162.

It can be written as a sum of positive squares in 16 ways, for example, as 978375841 + 260118360324 = 31279^2 + 510018^2 .

It is not a de Polignac number, because 261096736165 - 2⁵ = 261096736133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 94839429 + ... + 94842181.

It is an arithmetic number, because the mean of its divisors is an integer number (10087955703).

Almost surely, 2^261096736165 is an apocalyptic number.

It is an amenable number.

261096736165 is a deficient number, since it is larger than the sum of its proper divisors (61717846331).

261096736165 is a wasteful number, since it uses less digits than its factorization.

261096736165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249.

The product of its (nonzero) digits is 2449440, while the sum is 52.

The spelling of 261096736165 in words is "two hundred sixty-one billion, ninety-six million, seven hundred thirty-six thousand, one hundred sixty-five".