206620012001 has 16 divisors (see below), whose sum is σ = 235618954704. Its totient is φ = 179494754304.

The previous prime is 206620011991. The next prime is 206620012003. The reversal of 206620012001 is 100210026602.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 25535720401 + 181084291600 = 159799^2 + 425540^2 .

It is a cyclic number.

It is not a de Polignac number, because 206620012001 - 2⁶ = 206620011937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206620012003) 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 in 15 ways as a sum of consecutive naturals, for example, 5056685 + ... + 5097381.

It is an arithmetic number, because the mean of its divisors is an integer number (14726184669).

Almost surely, 2^206620012001 is an apocalyptic number.

It is an amenable number.

206620012001 is a deficient number, since it is larger than the sum of its proper divisors (28998942703).

206620012001 is a wasteful number, since it uses less digits than its factorization.

206620012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63700.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 206620012001 its reverse (100210026602), we get a palindrome (306830038603).

The spelling of 206620012001 in words is "two hundred six billion, six hundred twenty million, twelve thousand, one".