261108081777923 has 4 divisors (see below), whose sum is σ = 261141996330600. Its totient is φ = 261074167225248.

The previous prime is 261108081777877. The next prime is 261108081777953. The reversal of 261108081777923 is 329777180801162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261108081777923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261108081777953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16957264790 + ... + 16957280187.

It is an arithmetic number, because the mean of its divisors is an integer number (65285499082650).

Almost surely, 2^{261108081777923} is an apocalyptic number.

261108081777923 is a deficient number, since it is larger than the sum of its proper divisors (33914552677).

261108081777923 is an equidigital number, since it uses as much as digits as its factorization.

261108081777923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33914552676.

The product of its (nonzero) digits is 14224896, while the sum is 62.

The spelling of 261108081777923 in words is "two hundred sixty-one trillion, one hundred eight billion, eighty-one million, seven hundred seventy-seven thousand, nine hundred twenty-three".