206655645 has 16 divisors (see below), whose sum is σ = 377884800. Its totient is φ = 94471104.

The previous prime is 206655637. The next prime is 206655707. The reversal of 206655645 is 546556602.

It is a happy number.

It is not a de Polignac number, because 206655645 - 2³ = 206655637 is a prime.

It is a super-2 number, since 2×206655645² = 85413111220732050, which contains 22 as substring.

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, 983970 + ... + 984179.

It is an arithmetic number, because the mean of its divisors is an integer number (23617800).

Almost surely, 2^206655645 is an apocalyptic number.

It is an amenable number.

206655645 is a deficient number, since it is larger than the sum of its proper divisors (171229155).

206655645 is a wasteful number, since it uses less digits than its factorization.

206655645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968164.

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 206655645 is about 14375.5224252895. The cubic root of 206655645 is about 591.2199644450.

The spelling of 206655645 in words is "two hundred six million, six hundred fifty-five thousand, six hundred forty-five".