11989385856 has 384 divisors, whose sum is σ = 41707310400. Its totient is φ = 3380299776.

The previous prime is 11989385839. The next prime is 11989385867. The reversal of 11989385856 is 65858398911.

11989385856 is a `hidden beast` number, since 1 + 19 + 8 + 9 + 38 + 585 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 11989385793 and 11989385802.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14055126 + ... + 14055978.

Almost surely, 2^11989385856 is an apocalyptic number.

11989385856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11989385856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20853655200).

11989385856 is an abundant number, since it is smaller than the sum of its proper divisors (29717924544).

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

11989385856 is an equidigital number, since it uses as much as digits as its factorization.

11989385856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973 (or 948 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 63.

The spelling of 11989385856 in words is "eleven billion, nine hundred eighty-nine million, three hundred eighty-five thousand, eight hundred fifty-six".