19812042986784 has 192 divisors, whose sum is σ = 55545858708480. Its totient is φ = 6169443840000.

The previous prime is 19812042986737. The next prime is 19812042986789. The reversal of 19812042986784 is 48768924021891.

It is not an unprimeable number, because it can be changed into a prime (19812042986789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 536878734 + ... + 536915634.

It is an arithmetic number, because the mean of its divisors is an integer number (289301347440).

Almost surely, 2^{19812042986784} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19812042986784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27772929354240).

19812042986784 is an abundant number, since it is smaller than the sum of its proper divisors (35733815721696).

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

19812042986784 is a wasteful number, since it uses less digits than its factorization.

19812042986784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43195 (or 43187 counting only the distinct ones).

The product of its (nonzero) digits is 111476736, while the sum is 69.

The spelling of 19812042986784 in words is "nineteen trillion, eight hundred twelve billion, forty-two million, nine hundred eighty-six thousand, seven hundred eighty-four".