11989660550 has 72 divisors (see below), whose sum is σ = 27467788824. Its totient is φ = 3868919040.

The previous prime is 11989660531. The next prime is 11989660619. The reversal of 11989660550 is 5506698911.

11989660550 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (50).

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 35 ways as a sum of consecutive naturals, for example, 102284 + ... + 185583.

It is an arithmetic number, because the mean of its divisors is an integer number (381497067).

Almost surely, 2^11989660550 is an apocalyptic number.

11989660550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11989660550 is an abundant number, since it is smaller than the sum of its proper divisors (15478128274).

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

11989660550 is a wasteful number, since it uses less digits than its factorization.

11989660550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287910 (or 287898 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 50.

The spelling of 11989660550 in words is "eleven billion, nine hundred eighty-nine million, six hundred sixty thousand, five hundred fifty".