261655205 has 16 divisors (see below), whose sum is σ = 359192064. Its totient is φ = 179245440.

The previous prime is 261655193. The next prime is 261655237. The reversal of 261655205 is 502556162.

261655205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261655205 - 2⁸ = 261654949 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40049 + ... + 46121.

It is an arithmetic number, because the mean of its divisors is an integer number (22449504).

Almost surely, 2^261655205 is an apocalyptic number.

It is an amenable number.

261655205 is a deficient number, since it is larger than the sum of its proper divisors (97536859).

261655205 is a wasteful number, since it uses less digits than its factorization.

261655205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7316.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 261655205 is about 16175.7597966834. The cubic root of 261655205 is about 639.6019701186.

The spelling of 261655205 in words is "two hundred sixty-one million, six hundred fifty-five thousand, two hundred five".