12191554399872 has 256 divisors, whose sum is σ = 36443877350400. Its totient is φ = 3588312711168.

The previous prime is 12191554399867. The next prime is 12191554399877. The reversal of 12191554399872 is 27899345519121.

It is an interprime number because it is at equal distance from previous prime (12191554399867) and next prime (12191554399877).

It is not an unprimeable number, because it can be changed into a prime (12191554399877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12298143 + ... + 13252449.

It is an arithmetic number, because the mean of its divisors is an integer number (142358895900).

Almost surely, 2^{12191554399872} is an apocalyptic number.

12191554399872 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 12191554399872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18221938675200).

12191554399872 is an abundant number, since it is smaller than the sum of its proper divisors (24252322950528).

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

12191554399872 is a wasteful number, since it uses less digits than its factorization.

12191554399872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954463 (or 954451 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 66.

The spelling of 12191554399872 in words is "twelve trillion, one hundred ninety-one billion, five hundred fifty-four million, three hundred ninety-nine thousand, eight hundred seventy-two".