11531636473 has 16 divisors (see below), whose sum is σ = 13733009280. Its totient is φ = 9473740416.

The previous prime is 11531636443. The next prime is 11531636509. The reversal of 11531636473 is 37463613511.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-11531636473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11531636443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179511 + ... + 235132.

It is an arithmetic number, because the mean of its divisors is an integer number (858313080).

Almost surely, 2^11531636473 is an apocalyptic number.

It is an amenable number.

11531636473 is a deficient number, since it is larger than the sum of its proper divisors (2201372807).

11531636473 is a wasteful number, since it uses less digits than its factorization.

11531636473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414816.

The product of its digits is 136080, while the sum is 40.

The spelling of 11531636473 in words is "eleven billion, five hundred thirty-one million, six hundred thirty-six thousand, four hundred seventy-three".