206664001 has 2 divisors, whose sum is σ = 206664002. Its totient is φ = 206664000.

The previous prime is 206663999. The next prime is 206664023. The reversal of 206664001 is 100466602.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181171600 + 25492401 = 13460^2 + 5049^2 .

It is a cyclic number.

It is not a de Polignac number, because 206664001 - 2¹ = 206663999 is a prime.

Together with 206663999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (206664061) 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, 103332000 + 103332001.

It is an arithmetic number, because the mean of its divisors is an integer number (103332001).

Almost surely, 2^206664001 is an apocalyptic number.

It is an amenable number.

206664001 is a deficient number, since it is larger than the sum of its proper divisors (1).

206664001 is an equidigital number, since it uses as much as digits as its factorization.

206664001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 206664001 is about 14375.8130552675. The cubic root of 206664001 is about 591.2279328819.

The spelling of 206664001 in words is "two hundred six million, six hundred sixty-four thousand, one".