206642665001 has 2 divisors, whose sum is σ = 206642665002. Its totient is φ = 206642665000.

The previous prime is 206642664997. The next prime is 206642665013. The reversal of 206642665001 is 100566246602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126170592025 + 80472072976 = 355205^2 + 283676^2 .

It is a cyclic number.

It is not a de Polignac number, because 206642665001 - 2² = 206642664997 is a prime.

It is not a weakly prime, because it can be changed into another prime (206642665091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103321332500 + 103321332501.

It is an arithmetic number, because the mean of its divisors is an integer number (103321332501).

Almost surely, 2^206642665001 is an apocalyptic number.

It is an amenable number.

206642665001 is a deficient number, since it is larger than the sum of its proper divisors (1).

206642665001 is an equidigital number, since it uses as much as digits as its factorization.

206642665001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 206642665001 in words is "two hundred six billion, six hundred forty-two million, six hundred sixty-five thousand, one".