261441866 has 16 divisors (see below), whose sum is σ = 453587904. Its totient is φ = 110696064.

The previous prime is 261441857. The next prime is 261441883. The reversal of 261441866 is 668144162.

261441866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111335 + ... + 113658.

It is an arithmetic number, because the mean of its divisors is an integer number (28349244).

Almost surely, 2^261441866 is an apocalyptic number.

261441866 is a deficient number, since it is larger than the sum of its proper divisors (192146038).

261441866 is a wasteful number, since it uses less digits than its factorization.

261441866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225085.

The product of its digits is 55296, while the sum is 38.

The square root of 261441866 is about 16169.1640476556. The cubic root of 261441866 is about 639.4280909779.

The spelling of 261441866 in words is "two hundred sixty-one million, four hundred forty-one thousand, eight hundred sixty-six".