206406562135 has 4 divisors (see below), whose sum is σ = 247687874568. Its totient is φ = 165125249704.

The previous prime is 206406562123. The next prime is 206406562157. The reversal of 206406562135 is 531265604602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206406562135 - 2¹⁹ = 206406037847 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20640656209 + ... + 20640656218.

It is an arithmetic number, because the mean of its divisors is an integer number (61921968642).

Almost surely, 2^206406562135 is an apocalyptic number.

206406562135 is a deficient number, since it is larger than the sum of its proper divisors (41281312433).

206406562135 is an equidigital number, since it uses as much as digits as its factorization.

206406562135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41281312432.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 206406562135 in words is "two hundred six billion, four hundred six million, five hundred sixty-two thousand, one hundred thirty-five".