261331115435 has 24 divisors (see below), whose sum is σ = 358754713296. Its totient is φ = 181631024640.

The previous prime is 261331115429. The next prime is 261331115449. The reversal of 261331115435 is 534511133162.

It is not a de Polignac number, because 261331115435 - 2¹⁶ = 261331049899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261331115395 and 261331115404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6937061 + ... + 6974630.

It is an arithmetic number, because the mean of its divisors is an integer number (14948113054).

Almost surely, 2^261331115435 is an apocalyptic number.

261331115435 is a deficient number, since it is larger than the sum of its proper divisors (97423597861).

261331115435 is a wasteful number, since it uses less digits than its factorization.

261331115435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13911743 (or 13911726 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

Adding to 261331115435 its reverse (534511133162), we get a palindrome (795842248597).

The spelling of 261331115435 in words is "two hundred sixty-one billion, three hundred thirty-one million, one hundred fifteen thousand, four hundred thirty-five".