261636231411 has 40 divisors (see below), whose sum is σ = 411780820880. Its totient is φ = 165094915392.

The previous prime is 261636231407. The next prime is 261636231413. The reversal of 261636231411 is 114132636162.

261636231411 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 3 + 6 + 231 + 411 = 666.

It is not a de Polignac number, because 261636231411 - 2² = 261636231407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261636231413) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1642965 + ... + 1795161.

It is an arithmetic number, because the mean of its divisors is an integer number (10294520522).

Almost surely, 2^261636231411 is an apocalyptic number.

261636231411 is a deficient number, since it is larger than the sum of its proper divisors (150144589469).

261636231411 is a wasteful number, since it uses less digits than its factorization.

261636231411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153345 (or 153336 counting only the distinct ones).

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

Adding to 261636231411 its reverse (114132636162), we get a palindrome (375768867573).

The spelling of 261636231411 in words is "two hundred sixty-one billion, six hundred thirty-six million, two hundred thirty-one thousand, four hundred eleven".