261646343242254 has 12 divisors (see below), whose sum is σ = 566900410358256. Its totient is φ = 87215447747412.

The previous prime is 261646343242237. The next prime is 261646343242259. The reversal of 261646343242254 is 452242343646162.

261646343242254 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 4 + 6 + 343 + 2 + 42 + 254 = 666.

261646343242254 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261646343242254.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261646343242259) 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, 7267953978934 + ... + 7267953978969.

It is an arithmetic number, because the mean of its divisors is an integer number (47241700863188).

Almost surely, 2^{261646343242254} is an apocalyptic number.

261646343242254 is an abundant number, since it is smaller than the sum of its proper divisors (305254067116002).

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

261646343242254 is a wasteful number, since it uses less digits than its factorization.

261646343242254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14535907957911 (or 14535907957908 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 54.

The spelling of 261646343242254 in words is "two hundred sixty-one trillion, six hundred forty-six billion, three hundred forty-three million, two hundred forty-two thousand, two hundred fifty-four".