261671104111 has 16 divisors (see below), whose sum is σ = 273069812448. Its totient is φ = 250531056000.

The previous prime is 261671104099. The next prime is 261671104159. The reversal of 261671104111 is 111401176162.

It is a cyclic number.

It is not a de Polignac number, because 261671104111 - 2²⁷ = 261536886383 is a prime.

It is a super-2 number, since 2×261671104111² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261671104411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394341 + ... + 823921.

It is an arithmetic number, because the mean of its divisors is an integer number (17066863278).

Almost surely, 2^261671104111 is an apocalyptic number.

261671104111 is a deficient number, since it is larger than the sum of its proper divisors (11398708337).

261671104111 is a wasteful number, since it uses less digits than its factorization.

261671104111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429882.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 261671104111 in words is "two hundred sixty-one billion, six hundred seventy-one million, one hundred four thousand, one hundred eleven".