261108442042218 has 24 divisors (see below), whose sum is σ = 565735804920000. Its totient is φ = 87036017014824.

The previous prime is 261108442042111. The next prime is 261108442042219. The reversal of 261108442042218 is 812240244801162.

261108442042218 is a `hidden beast` number, since 2 + 6 + 1 + 1 + 0 + 8 + 4 + 420 + 4 + 2 + 218 = 666.

It is not an unprimeable number, because it can be changed into a prime (261108442042219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1898383 + ... + 22930781.

It is an arithmetic number, because the mean of its divisors is an integer number (23572325205000).

Almost surely, 2^{261108442042218} is an apocalyptic number.

261108442042218 is an abundant number, since it is smaller than the sum of its proper divisors (304627362877782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261108442042218 is a wasteful number, since it uses less digits than its factorization.

261108442042218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21722106 (or 21722103 counting only the distinct ones).

The product of its (nonzero) digits is 393216, while the sum is 45.

The spelling of 261108442042218 in words is "two hundred sixty-one trillion, one hundred eight billion, four hundred forty-two million, forty-two thousand, two hundred eighteen".