11005509987 has 16 divisors (see below), whose sum is σ = 16510848000. Its totient is φ = 7244131752.

The previous prime is 11005509917. The next prime is 11005510007. The reversal of 11005509987 is 78990550011.

11005509987 is a `hidden beast` number, since 1 + 1 + 0 + 0 + 550 + 9 + 98 + 7 = 666.

It is not a de Polignac number, because 11005509987 - 2¹² = 11005505891 is a prime.

It is a super-2 number, since 2×11005509987² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11005509917) 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, 2577687 + ... + 2581952.

It is an arithmetic number, because the mean of its divisors is an integer number (1031928000).

Almost surely, 2^11005509987 is an apocalyptic number.

11005509987 is a deficient number, since it is larger than the sum of its proper divisors (5505338013).

11005509987 is an equidigital number, since it uses as much as digits as its factorization.

11005509987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5159727 (or 5159721 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 45.

The spelling of 11005509987 in words is "eleven billion, five million, five hundred nine thousand, nine hundred eighty-seven".