11663531912 has 12 divisors (see below), whose sum is σ = 21869695095. Its totient is φ = 5831613224.

The previous prime is 11663531899. The next prime is 11663531933. The reversal of 11663531912 is 21913536611.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 5831765956 + 5831765956 = 76366^2 + 76366^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=76366.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 286373 + ... + 324555.

Almost surely, 2^11663531912 is an apocalyptic number.

It is an amenable number.

11663531912 is a deficient number, since it is larger than the sum of its proper divisors (10206163183).

11663531912 is an frugal number, since it uses more digits than its factorization.

11663531912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76372 (or 38185 counting only the distinct ones).

The product of its digits is 29160, while the sum is 38.

The spelling of 11663531912 in words is "eleven billion, six hundred sixty-three million, five hundred thirty-one thousand, nine hundred twelve".