18719147448 has 216 divisors, whose sum is σ = 54620584200. Its totient is φ = 5790939264.

The previous prime is 18719147429. The next prime is 18719147467. The reversal of 18719147448 is 84474191781.

18719147448 is a `hidden beast` number, since 1 + 8 + 7 + 191 + 4 + 7 + 448 = 666.

It is an interprime number because it is at equal distance from previous prime (18719147429) and next prime (18719147467).

It is a junction number, because it is equal to n+sod(n) for n = 18719147394 and 18719147403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 52142293 + ... + 52142651.

It is an arithmetic number, because the mean of its divisors is an integer number (252873075).

Almost surely, 2^18719147448 is an apocalyptic number.

18719147448 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 18719147448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27310292100).

18719147448 is an abundant number, since it is smaller than the sum of its proper divisors (35901436752).

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

18719147448 is a wasteful number, since it uses less digits than its factorization.

18719147448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 424 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The spelling of 18719147448 in words is "eighteen billion, seven hundred nineteen million, one hundred forty-seven thousand, four hundred forty-eight".