261646343242255 has 16 divisors (see below), whose sum is σ = 330502125381120. Its totient is φ = 198299497686048.

The previous prime is 261646343242237. The next prime is 261646343242259. The reversal of 261646343242255 is 552242343646162.

It is a cyclic number.

It is not a de Polignac number, because 261646343242255 - 2⁵ = 261646343242223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261646343242196 and 261646343242205.

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 15 ways as a sum of consecutive naturals, for example, 15535414 + ... + 27652156.

It is an arithmetic number, because the mean of its divisors is an integer number (20656382836320).

Almost surely, 2^{261646343242255} is an apocalyptic number.

261646343242255 is a deficient number, since it is larger than the sum of its proper divisors (68855782138865).

261646343242255 is a wasteful number, since it uses less digits than its factorization.

261646343242255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12344070.

The product of its digits is 49766400, while the sum is 55.

The spelling of 261646343242255 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-five".