11551999808 has 14 divisors (see below), whose sum is σ = 22923499746. Its totient is φ = 5775999872.

The previous prime is 11551999801. The next prime is 11551999841. The reversal of 11551999808 is 80899915511.

It can be written as a sum of positive squares in only one way, i.e., 10981363264 + 570636544 = 104792^2 + 23888^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551999801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90249935 + ... + 90250062.

It is an arithmetic number, because the mean of its divisors is an integer number (1637392839).

Almost surely, 2^11551999808 is an apocalyptic number.

It is an amenable number.

11551999808 is a deficient number, since it is larger than the sum of its proper divisors (11371499938).

11551999808 is an equidigital number, since it uses as much as digits as its factorization.

11551999808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180500009 (or 180499999 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 56.

The spelling of 11551999808 in words is "eleven billion, five hundred fifty-one million, nine hundred ninety-nine thousand, eight hundred eight".