261431271117111 has 16 divisors (see below), whose sum is σ = 359071700924160. Its totient is φ = 169086673951680.

The previous prime is 261431271117103. The next prime is 261431271117131. The reversal of 261431271117111 is 111711172134162.

261431271117111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261431271117111 - 2³ = 261431271117103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261431271117111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261431271117131) 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, 5937010075 + ... + 5937054108.

It is an arithmetic number, because the mean of its divisors is an integer number (22441981307760).

Almost surely, 2^{261431271117111} is an apocalyptic number.

261431271117111 is a deficient number, since it is larger than the sum of its proper divisors (97640429807049).

261431271117111 is a wasteful number, since it uses less digits than its factorization.

261431271117111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11874064406.

The product of its digits is 14112, while the sum is 39.

The spelling of 261431271117111 in words is "two hundred sixty-one trillion, four hundred thirty-one billion, two hundred seventy-one million, one hundred seventeen thousand, one hundred eleven".