205661255 has 4 divisors (see below), whose sum is σ = 246793512. Its totient is φ = 164529000.

The previous prime is 205661231. The next prime is 205661279. The reversal of 205661255 is 552166502.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (205661231) and next prime (205661279).

It is not a de Polignac number, because 205661255 - 2⁶ = 205661191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20566121 + ... + 20566130.

It is an arithmetic number, because the mean of its divisors is an integer number (61698378).

Almost surely, 2^205661255 is an apocalyptic number.

205661255 is a deficient number, since it is larger than the sum of its proper divisors (41132257).

205661255 is an equidigital number, since it uses as much as digits as its factorization.

205661255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41132256.

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

The square root of 205661255 is about 14340.8944979035. The cubic root of 205661255 is about 590.2701578056.

The spelling of 205661255 in words is "two hundred five million, six hundred sixty-one thousand, two hundred fifty-five".