261085391263 has 2 divisors, whose sum is σ = 261085391264. Its totient is φ = 261085391262.

The previous prime is 261085391261. The next prime is 261085391323. The reversal of 261085391263 is 362193580162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261085391263 - 2¹ = 261085391261 is a prime.

Together with 261085391261, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261085391261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130542695631 + 130542695632.

It is an arithmetic number, because the mean of its divisors is an integer number (130542695632).

Almost surely, 2^261085391263 is an apocalyptic number.

261085391263 is a deficient number, since it is larger than the sum of its proper divisors (1).

261085391263 is an equidigital number, since it uses as much as digits as its factorization.

261085391263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 261085391263 in words is "two hundred sixty-one billion, eighty-five million, three hundred ninety-one thousand, two hundred sixty-three".