206654661 has 6 divisors (see below), whose sum is σ = 298501190. Its totient is φ = 137769768.

The previous prime is 206654647. The next prime is 206654663. The reversal of 206654661 is 166456602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 110124036 + 96530625 = 10494^2 + 9825^2 .

It is not a de Polignac number, because 206654661 - 2⁶ = 206654597 is a prime.

It is a super-2 number, since 2×206654661² = 85412297826049842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206654663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11480806 + ... + 11480823.

Almost surely, 2^206654661 is an apocalyptic number.

It is an amenable number.

206654661 is a deficient number, since it is larger than the sum of its proper divisors (91846529).

206654661 is a wasteful number, since it uses less digits than its factorization.

206654661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22961635 (or 22961632 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 206654661 is about 14375.4882004056. The cubic root of 206654661 is about 591.2190260701.

The spelling of 206654661 in words is "two hundred six million, six hundred fifty-four thousand, six hundred sixty-one".