11665311203 has 16 divisors (see below), whose sum is σ = 14408431296. Its totient is φ = 9196830720.

The previous prime is 11665311181. The next prime is 11665311227. The reversal of 11665311203 is 30211356611.

It is not a de Polignac number, because 11665311203 - 2¹² = 11665307107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11665311283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202526 + ... + 253667.

It is an arithmetic number, because the mean of its divisors is an integer number (900526956).

Almost surely, 2^11665311203 is an apocalyptic number.

11665311203 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11665311203 is a deficient number, since it is larger than the sum of its proper divisors (2743120093).

11665311203 is a wasteful number, since it uses less digits than its factorization.

11665311203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456494.

The product of its (nonzero) digits is 3240, while the sum is 29.

Adding to 11665311203 its reverse (30211356611), we get a palindrome (41876667814).

The spelling of 11665311203 in words is "eleven billion, six hundred sixty-five million, three hundred eleven thousand, two hundred three".