206655 has 16 divisors (see below), whose sum is σ = 345600. Its totient is φ = 105248.

The previous prime is 206651. The next prime is 206699. The reversal of 206655 is 556602.

It is not a de Polignac number, because 206655 - 2² = 206651 is a prime.

206655 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46 + ... + 644.

It is an arithmetic number, because the mean of its divisors is an integer number (21600).

2²⁰⁶⁶⁵⁵ is an apocalyptic number.

206655 is a deficient number, since it is larger than the sum of its proper divisors (138945).

206655 is a wasteful number, since it uses less digits than its factorization.

206655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 206655 is about 454.5932247625. The cubic root of 206655 is about 59.1219349352.

It can be divided in two parts, 206 and 655, that added together give a triangular number (861 = T₄₁).

The spelling of 206655 in words is "two hundred six thousand, six hundred fifty-five".