261419691267 has 24 divisors (see below), whose sum is σ = 431773421664. Its totient is φ = 149305330944.

The previous prime is 261419691209. The next prime is 261419691341. The reversal of 261419691267 is 762196914162.

261419691267 is a `hidden beast` number, since 2 + 614 + 1 + 9 + 6 + 9 + 12 + 6 + 7 = 666.

It is not a de Polignac number, because 261419691267 - 2²⁷ = 261285473539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261419693267) 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 23 ways as a sum of consecutive naturals, for example, 951558 + ... + 1195115.

It is an arithmetic number, because the mean of its divisors is an integer number (17990559236).

Almost surely, 2^261419691267 is an apocalyptic number.

261419691267 is a deficient number, since it is larger than the sum of its proper divisors (170353730397).

261419691267 is a wasteful number, since it uses less digits than its factorization.

261419691267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148619 (or 2148616 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 261419691267 in words is "two hundred sixty-one billion, four hundred nineteen million, six hundred ninety-one thousand, two hundred sixty-seven".