206243266401 has 12 divisors (see below), whose sum is σ = 299571227280. Its totient is φ = 136727378520.

The previous prime is 206243266393. The next prime is 206243266403. The reversal of 206243266401 is 104662342602.

206243266401 is a `hidden beast` number, since 2 + 0 + 6 + 2 + 4 + 3 + 2 + 6 + 640 + 1 = 666.

It is not a de Polignac number, because 206243266401 - 2³ = 206243266393 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (206243266403) 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 11 ways as a sum of consecutive naturals, for example, 64009335 + ... + 64012556.

It is an arithmetic number, because the mean of its divisors is an integer number (24964268940).

Almost surely, 2^206243266401 is an apocalyptic number.

It is an amenable number.

206243266401 is a deficient number, since it is larger than the sum of its proper divisors (93327960879).

206243266401 is a wasteful number, since it uses less digits than its factorization.

206243266401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128022076 (or 128022073 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 206243266401 in words is "two hundred six billion, two hundred forty-three million, two hundred sixty-six thousand, four hundred one".