11581680209 has 8 divisors (see below), whose sum is σ = 12637568352. Its totient is φ = 10526293440.

The previous prime is 11581680203. The next prime is 11581680251. The reversal of 11581680209 is 90208618511.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11581680209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11581680203) 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, 76199 + ... + 170204.

It is an arithmetic number, because the mean of its divisors is an integer number (1579696044).

Almost surely, 2^11581680209 is an apocalyptic number.

It is an amenable number.

11581680209 is a deficient number, since it is larger than the sum of its proper divisors (1055888143).

11581680209 is a wasteful number, since it uses less digits than its factorization.

11581680209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250687.

The product of its (nonzero) digits is 34560, while the sum is 41.

The spelling of 11581680209 in words is "eleven billion, five hundred eighty-one million, six hundred eighty thousand, two hundred nine".