261256854111 has 16 divisors (see below), whose sum is σ = 396532143360. Its totient is φ = 151453248320.

The previous prime is 261256854059. The next prime is 261256854121. The reversal of 261256854111 is 111458652162.

It is not a de Polignac number, because 261256854111 - 2⁷ = 261256853983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261256854121) 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 15 ways as a sum of consecutive naturals, for example, 172105206 + ... + 172106723.

It is an arithmetic number, because the mean of its divisors is an integer number (24783258960).

Almost surely, 2^261256854111 is an apocalyptic number.

261256854111 is a deficient number, since it is larger than the sum of its proper divisors (135275289249).

261256854111 is a wasteful number, since it uses less digits than its factorization.

261256854111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344211966.

The product of its digits is 115200, while the sum is 42.

The spelling of 261256854111 in words is "two hundred sixty-one billion, two hundred fifty-six million, eight hundred fifty-four thousand, one hundred eleven".