206771661 has 12 divisors (see below), whose sum is σ = 314389920. Its totient is φ = 130592520.

The previous prime is 206771647. The next prime is 206771683. The reversal of 206771661 is 166177602.

206771661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206771661 - 2⁶ = 206771597 is a prime.

It is a super-3 number, since 3×206771661³ (a number of 26 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206771611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 604425 + ... + 604766.

It is an arithmetic number, because the mean of its divisors is an integer number (26199160).

Almost surely, 2^206771661 is an apocalyptic number.

It is an amenable number.

206771661 is a deficient number, since it is larger than the sum of its proper divisors (107618259).

206771661 is a wasteful number, since it uses less digits than its factorization.

206771661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209216 (or 1209213 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 206771661 is about 14379.5570515924. The cubic root of 206771661 is about 591.3305802535.

The spelling of 206771661 in words is "two hundred six million, seven hundred seventy-one thousand, six hundred sixty-one".