261543742263364 has 48 divisors (see below), whose sum is σ = 528767242508736. Its totient is φ = 111872330931200.

The previous prime is 261543742263361. The next prime is 261543742263371. The reversal of 261543742263364 is 463362247345162.

It is a junction number, because it is equal to n+sod(n) for n = 261543742263299 and 261543742263308.

It is not an unprimeable number, because it can be changed into a prime (261543742263361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23544697 + ... + 32824384.

It is an arithmetic number, because the mean of its divisors is an integer number (11015984218932).

Almost surely, 2^{261543742263364} is an apocalyptic number.

It is an amenable number.

261543742263364 is an abundant number, since it is smaller than the sum of its proper divisors (267223500245372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261543742263364 is a wasteful number, since it uses less digits than its factorization.

261543742263364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56375316 (or 56375314 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 58.

The spelling of 261543742263364 in words is "two hundred sixty-one trillion, five hundred forty-three billion, seven hundred forty-two million, two hundred sixty-three thousand, three hundred sixty-four".