206672657 has 2 divisors, whose sum is σ = 206672658. Its totient is φ = 206672656.

The previous prime is 206672617. The next prime is 206672659. The reversal of 206672657 is 756276602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140754496 + 65918161 = 11864^2 + 8119^2 .

It is a cyclic number.

It is not a de Polignac number, because 206672657 - 2¹⁴ = 206656273 is a prime.

Together with 206672659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (206672659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103336328 + 103336329.

It is an arithmetic number, because the mean of its divisors is an integer number (103336329).

Almost surely, 2^206672657 is an apocalyptic number.

It is an amenable number.

206672657 is a deficient number, since it is larger than the sum of its proper divisors (1).

206672657 is an equidigital number, since it uses as much as digits as its factorization.

206672657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 206672657 is about 14376.1141133479. The cubic root of 206672657 is about 591.2361871780.

The spelling of 206672657 in words is "two hundred six million, six hundred seventy-two thousand, six hundred fifty-seven".