261162416331 has 24 divisors (see below), whose sum is σ = 382441907120. Its totient is φ = 171705401856.

The previous prime is 261162416321. The next prime is 261162416369. The reversal of 261162416331 is 133614261162.

261162416331 is a `hidden beast` number, since 2 + 6 + 1 + 16 + 2 + 4 + 1 + 633 + 1 = 666.

It is not a de Polignac number, because 261162416331 - 2⁶ = 261162416267 is a prime.

It is a super-2 number, since 2×261162416331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261162416321) 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 23 ways as a sum of consecutive naturals, for example, 10043715 + ... + 10069683.

Almost surely, 2^261162416331 is an apocalyptic number.

261162416331 is a deficient number, since it is larger than the sum of its proper divisors (121279490789).

261162416331 is a wasteful number, since it uses less digits than its factorization.

261162416331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41355 (or 41352 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

Adding to 261162416331 its reverse (133614261162), we get a palindrome (394776677493).

The spelling of 261162416331 in words is "two hundred sixty-one billion, one hundred sixty-two million, four hundred sixteen thousand, three hundred thirty-one".