11197555663 has 12 divisors (see below), whose sum is σ = 13223344080. Its totient is φ = 9288289440.

The previous prime is 11197555637. The next prime is 11197555673. The reversal of 11197555663 is 36655579111.

It is not a de Polignac number, because 11197555663 - 2⁹ = 11197555151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11197555613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 825558 + ... + 839011.

It is an arithmetic number, because the mean of its divisors is an integer number (1101945340).

Almost surely, 2^11197555663 is an apocalyptic number.

11197555663 is a deficient number, since it is larger than the sum of its proper divisors (2025788417).

11197555663 is an equidigital number, since it uses as much as digits as its factorization.

11197555663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664638 (or 1664607 counting only the distinct ones).

The product of its digits is 850500, while the sum is 49.

The spelling of 11197555663 in words is "eleven billion, one hundred ninety-seven million, five hundred fifty-five thousand, six hundred sixty-three".