261944288839 has 8 divisors (see below), whose sum is σ = 270416430720. Its totient is φ = 253473542400.

The previous prime is 261944288833. The next prime is 261944288849. The reversal of 261944288839 is 938882449162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261944288839 - 2¹⁵ = 261944256071 is a prime.

It is a super-2 number, since 2×261944288839² (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 (261944288833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39519 + ... + 724879.

It is an arithmetic number, because the mean of its divisors is an integer number (33802053840).

Almost surely, 2^261944288839 is an apocalyptic number.

261944288839 is a deficient number, since it is larger than the sum of its proper divisors (8472141881).

261944288839 is a wasteful number, since it uses less digits than its factorization.

261944288839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697721.

The product of its digits is 47775744, while the sum is 64.

The spelling of 261944288839 in words is "two hundred sixty-one billion, nine hundred forty-four million, two hundred eighty-eight thousand, eight hundred thirty-nine".