206666641 has 2 divisors, whose sum is σ = 206666642. Its totient is φ = 206666640.

The previous prime is 206666617. The next prime is 206666657. The reversal of 206666641 is 146666602.

206666641 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., 137710225 + 68956416 = 11735^2 + 8304^2 .

It is a cyclic number.

It is not a de Polignac number, because 206666641 - 2²³ = 198278033 is a prime.

It is a super-2 number, since 2×206666641² = 85422201004445762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206666641.

It is not a weakly prime, because it can be changed into another prime (206666611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103333320 + 103333321.

It is an arithmetic number, because the mean of its divisors is an integer number (103333321).

Almost surely, 2^206666641 is an apocalyptic number.

It is an amenable number.

206666641 is a deficient number, since it is larger than the sum of its proper divisors (1).

206666641 is an equidigital number, since it uses as much as digits as its factorization.

206666641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 206666641 is about 14375.9048758678. The cubic root of 206666641 is about 591.2304503903.

The spelling of 206666641 in words is "two hundred six million, six hundred sixty-six thousand, six hundred forty-one".