18891675449856 has 640 divisors, whose sum is σ = 64144217364480. Its totient is φ = 5433915801600.

The previous prime is 18891675449839. The next prime is 18891675449869. The reversal of 18891675449856 is 65894457619881.

18891675449856 is a `hidden beast` number, since 1 + 8 + 8 + 9 + 1 + 6 + 75 + 4 + 498 + 56 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 458148216 + ... + 458189448.

It is an arithmetic number, because the mean of its divisors is an integer number (100225339632).

Almost surely, 2^{18891675449856} is an apocalyptic number.

18891675449856 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 18891675449856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32072108682240).

18891675449856 is an abundant number, since it is smaller than the sum of its proper divisors (45252541914624).

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

18891675449856 is a wasteful number, since it uses less digits than its factorization.

18891675449856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41425 (or 41403 counting only the distinct ones).

The product of its digits is 4180377600, while the sum is 81.

The spelling of 18891675449856 in words is "eighteen trillion, eight hundred ninety-one billion, six hundred seventy-five million, four hundred forty-nine thousand, eight hundred fifty-six".