261655206 has 32 divisors (see below), whose sum is σ = 533537280. Its totient is φ = 85521696.

The previous prime is 261655193. The next prime is 261655237. The reversal of 261655206 is 602556162.

It is a happy number.

261655206 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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196515 + ... + 197841.

It is an arithmetic number, because the mean of its divisors is an integer number (16673040).

Almost surely, 2^261655206 is an apocalyptic number.

261655206 is an abundant number, since it is smaller than the sum of its proper divisors (271882074).

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

261655206 is a wasteful number, since it uses less digits than its factorization.

261655206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 261655206 is about 16175.7598275939. The cubic root of 261655206 is about 639.6019709334.

The spelling of 261655206 in words is "two hundred sixty-one million, six hundred fifty-five thousand, two hundred six".