19481773349808 has 400 divisors, whose sum is σ = 70314960697344. Its totient is φ = 5059074309120.

The previous prime is 19481773349719. The next prime is 19481773349849. The reversal of 19481773349808 is 80894337718491.

19481773349808 is a `hidden beast` number, since 1 + 9 + 48 + 177 + 334 + 9 + 80 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 507622716 + ... + 507661092.

Almost surely, 2^{19481773349808} is an apocalyptic number.

19481773349808 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 19481773349808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35157480348672).

19481773349808 is an abundant number, since it is smaller than the sum of its proper divisors (50833187347536).

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

19481773349808 is a wasteful number, since it uses less digits than its factorization.

19481773349808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43502 (or 43487 counting only the distinct ones).

The product of its (nonzero) digits is 292626432, while the sum is 72.

The spelling of 19481773349808 in words is "nineteen trillion, four hundred eighty-one billion, seven hundred seventy-three million, three hundred forty-nine thousand, eight hundred eight".