665555113110203 has 2 divisors, whose sum is σ = 665555113110204. Its totient is φ = 665555113110202.

The previous prime is 665555113110187. The next prime is 665555113110241. The reversal of 665555113110203 is 302011311555566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665555113110203 - 2⁴ = 665555113110187 is a prime.

It is not a weakly prime, because it can be changed into another prime (665555113110803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332777556555101 + 332777556555102.

It is an arithmetic number, because the mean of its divisors is an integer number (332777556555102).

Almost surely, 2^{665555113110203} is an apocalyptic number.

665555113110203 is a deficient number, since it is larger than the sum of its proper divisors (1).

665555113110203 is an equidigital number, since it uses as much as digits as its factorization.

665555113110203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405000, while the sum is 44.

Adding to 665555113110203 its reverse (302011311555566), we get a palindrome (967566424665769).

The spelling of 665555113110203 in words is "six hundred sixty-five trillion, five hundred fifty-five billion, one hundred thirteen million, one hundred ten thousand, two hundred three".