11143133661 has 32 divisors (see below), whose sum is σ = 17253043200. Its totient is φ = 6326052480.

The previous prime is 11143133657. The next prime is 11143133693. The reversal of 11143133661 is 16633134111.

It is not a de Polignac number, because 11143133661 - 2² = 11143133657 is a prime.

It is a super-2 number, since 2×11143133661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11143133611) 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 31 ways as a sum of consecutive naturals, for example, 44041 + ... + 155646.

It is an arithmetic number, because the mean of its divisors is an integer number (539157600).

Almost surely, 2^11143133661 is an apocalyptic number.

11143133661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11143133661 is a deficient number, since it is larger than the sum of its proper divisors (6109909539).

11143133661 is a wasteful number, since it uses less digits than its factorization.

11143133661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199809.

The product of its digits is 3888, while the sum is 30.

Adding to 11143133661 its reverse (16633134111), we get a palindrome (27776267772).

The spelling of 11143133661 in words is "eleven billion, one hundred forty-three million, one hundred thirty-three thousand, six hundred sixty-one".