11557705209 has 8 divisors (see below), whose sum is σ = 15786134112. Its totient is φ = 7517206560.

The previous prime is 11557705199. The next prime is 11557705213. The reversal of 11557705209 is 90250775511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11557705209 - 2⁴ = 11557705193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11557705009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46982419 + ... + 46982664.

It is an arithmetic number, because the mean of its divisors is an integer number (1973266764).

Almost surely, 2^11557705209 is an apocalyptic number.

It is an amenable number.

11557705209 is a deficient number, since it is larger than the sum of its proper divisors (4228428903).

11557705209 is an equidigital number, since it uses as much as digits as its factorization.

11557705209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93965127.

The product of its (nonzero) digits is 110250, while the sum is 42.

The spelling of 11557705209 in words is "eleven billion, five hundred fifty-seven million, seven hundred five thousand, two hundred nine".