11188238985 has 288 divisors, whose sum is σ = 26674292736. Its totient is φ = 4227379200.

The previous prime is 11188238983. The next prime is 11188239017. The reversal of 11188238985 is 58983288111.

11188238985 is a `hidden beast` number, since 1 + 1 + 188 + 2 + 389 + 85 = 666.

It is not a de Polignac number, because 11188238985 - 2¹ = 11188238983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11188238983) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 20086327 + ... + 20086883.

It is an arithmetic number, because the mean of its divisors is an integer number (92619072).

Almost surely, 2^11188238985 is an apocalyptic number.

11188238985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11188238985 is an abundant number, since it is smaller than the sum of its proper divisors (15486053751).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11188238985 is a wasteful number, since it uses less digits than its factorization.

11188238985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 631 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 54.

The spelling of 11188238985 in words is "eleven billion, one hundred eighty-eight million, two hundred thirty-eight thousand, nine hundred eighty-five".