19663599045888 has 540 divisors, whose sum is σ = 68344524864000. Its totient is φ = 5606767724544.

The previous prime is 19663599045829. The next prime is 19663599045901. The reversal of 19663599045888 is 88854099536691.

19663599045888 is a `hidden beast` number, since 1 + 9 + 66 + 359 + 90 + 45 + 8 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

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 59 ways as a sum of consecutive naturals, for example, 506996545 + ... + 507035327.

Almost surely, 2^{19663599045888} is an apocalyptic number.

19663599045888 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 19663599045888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34172262432000).

19663599045888 is an abundant number, since it is smaller than the sum of its proper divisors (48680925818112).

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

19663599045888 is an equidigital number, since it uses as much as digits as its factorization.

19663599045888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39324 (or 39294 counting only the distinct ones).

The product of its (nonzero) digits is 4031078400, while the sum is 81.

The spelling of 19663599045888 in words is "nineteen trillion, six hundred sixty-three billion, five hundred ninety-nine million, forty-five thousand, eight hundred eighty-eight".