11989191551850 has 192 divisors, whose sum is σ = 33396487488000. Its totient is φ = 3162379104000.

The previous prime is 11989191551849. The next prime is 11989191551881. The reversal of 11989191551850 is 5815519198911.

11989191551850 is a `hidden beast` number, since 1 + 1 + 98 + 9 + 19 + 15 + 518 + 5 + 0 = 666.

It is a super-2 number, since 2×11989191551850² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 141625336 + ... + 141709964.

It is an arithmetic number, because the mean of its divisors is an integer number (173940039000).

Almost surely, 2^{11989191551850} is an apocalyptic number.

11989191551850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11989191551850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16698243744000).

11989191551850 is an abundant number, since it is smaller than the sum of its proper divisors (21407295936150).

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

11989191551850 is a wasteful number, since it uses less digits than its factorization.

11989191551850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85790 (or 85779 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 63.

The spelling of 11989191551850 in words is "eleven trillion, nine hundred eighty-nine billion, one hundred ninety-one million, five hundred fifty-one thousand, eight hundred fifty".