11989651968 has 320 divisors, whose sum is σ = 42331576320. Its totient is φ = 3276066816.

The previous prime is 11989651937. The next prime is 11989651979. The reversal of 11989651968 is 86915698911.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2222971 + ... + 2228357.

It is an arithmetic number, because the mean of its divisors is an integer number (132286176).

Almost surely, 2^11989651968 is an apocalyptic number.

11989651968 is a gapful number since it is divisible by the number (18) 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 11989651968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21165788160).

11989651968 is an abundant number, since it is smaller than the sum of its proper divisors (30341924352).

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

11989651968 is an equidigital number, since it uses as much as digits as its factorization.

11989651968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5444 (or 5422 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 63.

The spelling of 11989651968 in words is "eleven billion, nine hundred eighty-nine million, six hundred fifty-one thousand, nine hundred sixty-eight".