261215340135 has 16 divisors (see below), whose sum is σ = 419262988896. Its totient is φ = 138875366528.

The previous prime is 261215340103. The next prime is 261215340149. The reversal of 261215340135 is 531043512162.

It is a cyclic number.

It is not a de Polignac number, because 261215340135 - 2⁵ = 261215340103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261215340096 and 261215340105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27462684 + ... + 27472193.

It is an arithmetic number, because the mean of its divisors is an integer number (26203936806).

Almost surely, 2^261215340135 is an apocalyptic number.

261215340135 is a deficient number, since it is larger than the sum of its proper divisors (158047648761).

261215340135 is a wasteful number, since it uses less digits than its factorization.

261215340135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54935202.

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 261215340135 its reverse (531043512162), we get a palindrome (792258852297).

The spelling of 261215340135 in words is "two hundred sixty-one billion, two hundred fifteen million, three hundred forty thousand, one hundred thirty-five".