206223557311 has 2 divisors, whose sum is σ = 206223557312. Its totient is φ = 206223557310.

The previous prime is 206223557297. The next prime is 206223557339. The reversal of 206223557311 is 113755322602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206223557311 - 2¹⁵ = 206223524543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206223554311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103111778655 + 103111778656.

It is an arithmetic number, because the mean of its divisors is an integer number (103111778656).

Almost surely, 2^206223557311 is an apocalyptic number.

206223557311 is a deficient number, since it is larger than the sum of its proper divisors (1).

206223557311 is an equidigital number, since it uses as much as digits as its factorization.

206223557311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 37.

Adding to 206223557311 its reverse (113755322602), we get a palindrome (319978879913).

The spelling of 206223557311 in words is "two hundred six billion, two hundred twenty-three million, five hundred fifty-seven thousand, three hundred eleven".