206472661 has 2 divisors, whose sum is σ = 206472662. Its totient is φ = 206472660.

The previous prime is 206472611. The next prime is 206472671. The reversal of 206472661 is 166274602.

206472661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200760561 + 5712100 = 14169^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 206472661 - 2¹¹ = 206470613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206472611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103236330 + 103236331.

It is an arithmetic number, because the mean of its divisors is an integer number (103236331).

Almost surely, 2^206472661 is an apocalyptic number.

It is an amenable number.

206472661 is a deficient number, since it is larger than the sum of its proper divisors (1).

206472661 is an equidigital number, since it uses as much as digits as its factorization.

206472661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 206472661 is about 14369.1565862440. The cubic root of 206472661 is about 591.0454136195.

The spelling of 206472661 in words is "two hundred six million, four hundred seventy-two thousand, six hundred sixty-one".