19954858871808 has 330 divisors, whose sum is σ = 69317958257196. Its totient is φ = 5701387087872.

The previous prime is 19954858871749. The next prime is 19954858871809. The reversal of 19954858871808 is 80817885845991.

19954858871808 is a `hidden beast` number, since 1 + 9 + 9 + 548 + 58 + 8 + 7 + 18 + 0 + 8 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (19954858871809) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1609335 + ... + 6519177.

Almost surely, 2^{19954858871808} is an apocalyptic number.

19954858871808 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 19954858871808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34658979128598).

19954858871808 is an abundant number, since it is smaller than the sum of its proper divisors (49363099385388).

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

19954858871808 is an equidigital number, since it uses as much as digits as its factorization.

19954858871808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4909889 (or 4909855 counting only the distinct ones).

The product of its (nonzero) digits is 1857945600, while the sum is 81.

The spelling of 19954858871808 in words is "nineteen trillion, nine hundred fifty-four billion, eight hundred fifty-eight million, eight hundred seventy-one thousand, eight hundred eight".