11988643992 has 64 divisors (see below), whose sum is σ = 32356380000. Its totient is φ = 3679755264.

The previous prime is 11988643987. The next prime is 11988643999. The reversal of 11988643992 is 29934688911.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11988643999) 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 in 15 ways as a sum of consecutive naturals, for example, 80634 + ... + 174582.

Almost surely, 2^11988643992 is an apocalyptic number.

11988643992 is a gapful number since it is divisible by the number (12) 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 11988643992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16178190000).

11988643992 is an abundant number, since it is smaller than the sum of its proper divisors (20367736008).

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

11988643992 is a wasteful number, since it uses less digits than its factorization.

11988643992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94380 (or 94376 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 60.

It can be divided in two parts, 119886 and 43992, that added together give a triangular number (163878 = T₅₇₂).

The spelling of 11988643992 in words is "eleven billion, nine hundred eighty-eight million, six hundred forty-three thousand, nine hundred ninety-two".