11661487800 has 48 divisors (see below), whose sum is σ = 36150614040. Its totient is φ = 3109729920.

The previous prime is 11661487777. The next prime is 11661487897. The reversal of 11661487800 is 878416611.

11661487800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9717307 + ... + 9718506.

Almost surely, 2^11661487800 is an apocalyptic number.

11661487800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11661487800 is an abundant number, since it is smaller than the sum of its proper divisors (24489126240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11661487800 is a wasteful number, since it uses less digits than its factorization.

11661487800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19435832 (or 19435823 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 42.

The spelling of 11661487800 in words is "eleven billion, six hundred sixty-one million, four hundred eighty-seven thousand, eight hundred".