261941044859 has 6 divisors (see below), whose sum is σ = 283640303196. Its totient is φ = 241791733560.

The previous prime is 261941044847. The next prime is 261941044907. The reversal of 261941044859 is 958440149162.

It is not a de Polignac number, because 261941044859 - 2¹⁶ = 261940979323 is a prime.

It is a super-2 number, since 2×261941044859² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261941044859.

It is not an unprimeable number, because it can be changed into a prime (261941044159) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 774973337 + ... + 774973674.

It is an arithmetic number, because the mean of its divisors is an integer number (47273383866).

Almost surely, 2^261941044859 is an apocalyptic number.

261941044859 is a deficient number, since it is larger than the sum of its proper divisors (21699258337).

261941044859 is a wasteful number, since it uses less digits than its factorization.

261941044859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549947037 (or 1549947024 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 53.

The spelling of 261941044859 in words is "two hundred sixty-one billion, nine hundred forty-one million, forty-four thousand, eight hundred fifty-nine".