261280791022823 has 24 divisors (see below), whose sum is σ = 308648959971120. Its totient is φ = 219254391682560.

The previous prime is 261280791022787. The next prime is 261280791022913. The reversal of 261280791022823 is 328220197082162.

It is not a de Polignac number, because 261280791022823 - 2¹⁸ = 261280790760679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261280791022723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 198243173 + ... + 199556801.

It is an arithmetic number, because the mean of its divisors is an integer number (12860373332130).

Almost surely, 2^{261280791022823} is an apocalyptic number.

261280791022823 is a deficient number, since it is larger than the sum of its proper divisors (47368168948297).

261280791022823 is a wasteful number, since it uses less digits than its factorization.

261280791022823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420659 (or 1420646 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 261280791022823 in words is "two hundred sixty-one trillion, two hundred eighty billion, seven hundred ninety-one million, twenty-two thousand, eight hundred twenty-three".