11506500009 has 32 divisors (see below), whose sum is σ = 17119380480. Its totient is φ = 7638364800.

The previous prime is 11506500001. The next prime is 11506500011. The reversal of 11506500009 is 90000560511.

11506500009 is a `hidden beast` number, since 1 + 1 + 5 + 0 + 650 + 0 + 0 + 0 + 9 = 666.

It is not a de Polignac number, because 11506500009 - 2³ = 11506500001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11506500001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11610504 + ... + 11611494.

It is an arithmetic number, because the mean of its divisors is an integer number (534980640).

Almost surely, 2^11506500009 is an apocalyptic number.

It is an amenable number.

11506500009 is a deficient number, since it is larger than the sum of its proper divisors (5612880471).

11506500009 is an equidigital number, since it uses as much as digits as its factorization.

11506500009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2398 (or 2392 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The spelling of 11506500009 in words is "eleven billion, five hundred six million, five hundred thousand, nine".