206161663 has 2 divisors, whose sum is σ = 206161664. Its totient is φ = 206161662.

The previous prime is 206161633. The next prime is 206161691. The reversal of 206161663 is 366161602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206161663 - 2²⁵ = 172607231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206161633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103080831 + 103080832.

It is an arithmetic number, because the mean of its divisors is an integer number (103080832).

Almost surely, 2^206161663 is an apocalyptic number.

206161663 is a deficient number, since it is larger than the sum of its proper divisors (1).

206161663 is an equidigital number, since it uses as much as digits as its factorization.

206161663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 206161663 is about 14358.3307873861. The cubic root of 206161663 is about 590.7485118288.

The spelling of 206161663 in words is "two hundred six million, one hundred sixty-one thousand, six hundred sixty-three".