261340324613 has 16 divisors (see below), whose sum is σ = 282857097600. Its totient is φ = 240685473600.

The previous prime is 261340324589. The next prime is 261340324627. The reversal of 261340324613 is 316423043162.

It is a cyclic number.

It is not a de Polignac number, because 261340324613 - 2³⁶ = 192620847877 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 (261340324013) 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, 1080713 + ... + 1300238.

It is an arithmetic number, because the mean of its divisors is an integer number (17678568600).

Almost surely, 2^261340324613 is an apocalyptic number.

It is an amenable number.

261340324613 is a deficient number, since it is larger than the sum of its proper divisors (21516772987).

261340324613 is a wasteful number, since it uses less digits than its factorization.

261340324613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381132.

The product of its (nonzero) digits is 62208, while the sum is 35.

Adding to 261340324613 its reverse (316423043162), we get a palindrome (577763367775).

The spelling of 261340324613 in words is "two hundred sixty-one billion, three hundred forty million, three hundred twenty-four thousand, six hundred thirteen".