206324221555123 has 16 divisors (see below), whose sum is σ = 243946413432000. Its totient is φ = 170739670413312.

The previous prime is 206324221555091. The next prime is 206324221555159. The reversal of 206324221555123 is 321555122423602.

It is a happy number.

It is not a de Polignac number, because 206324221555123 - 2⁵ = 206324221555091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206324221555123.

It is not an unprimeable number, because it can be changed into a prime (206324221555223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30910638 + ... + 36988051.

It is an arithmetic number, because the mean of its divisors is an integer number (15246650839500).

Almost surely, 2^{206324221555123} is an apocalyptic number.

206324221555123 is a deficient number, since it is larger than the sum of its proper divisors (37622191876877).

206324221555123 is a wasteful number, since it uses less digits than its factorization.

206324221555123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67913694.

The product of its (nonzero) digits is 864000, while the sum is 43.

Adding to 206324221555123 its reverse (321555122423602), we get a palindrome (527879343978725).

The spelling of 206324221555123 in words is "two hundred six trillion, three hundred twenty-four billion, two hundred twenty-one million, five hundred fifty-five thousand, one hundred twenty-three".