206891655 has 16 divisors (see below), whose sum is σ = 342442080. Its totient is φ = 106537088.

The previous prime is 206891611. The next prime is 206891677. The reversal of 206891655 is 556198602.

206891655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 206891655 - 2⁹ = 206891143 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, 237372 + ... + 238241.

It is an arithmetic number, because the mean of its divisors is an integer number (21402630).

Almost surely, 2^206891655 is an apocalyptic number.

206891655 is a deficient number, since it is larger than the sum of its proper divisors (135550425).

206891655 is a wasteful number, since it uses less digits than its factorization.

206891655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475650.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 206891655 is about 14383.7288280891. The cubic root of 206891655 is about 591.4449453781. Note that the first 3 decimals are identical.

The spelling of 206891655 in words is "two hundred six million, eight hundred ninety-one thousand, six hundred fifty-five".