261121013368 has 16 divisors (see below), whose sum is σ = 494449445160. Its totient is φ = 129267828000.

The previous prime is 261121013339. The next prime is 261121013383. The reversal of 261121013368 is 863310121162.

261121013368 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161583978 + ... + 161585593.

Almost surely, 2^261121013368 is an apocalyptic number.

It is an amenable number.

261121013368 is a deficient number, since it is larger than the sum of its proper divisors (233328431792).

261121013368 is a wasteful number, since it uses less digits than its factorization.

261121013368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323169678 (or 323169674 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 261121013368 in words is "two hundred sixty-one billion, one hundred twenty-one million, thirteen thousand, three hundred sixty-eight".