18491624448 has 352 divisors, whose sum is σ = 57444387840. Its totient is φ = 5229527040.

The previous prime is 18491624447. The next prime is 18491624453. The reversal of 18491624448 is 84442619481.

It is a tau number, because it is divible by the number of its divisors (352).

It is a self number, because there is not a number n which added to its sum of digits gives 18491624448.

It is not an unprimeable number, because it can be changed into a prime (18491624441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53289811 + ... + 53290157.

Almost surely, 2^18491624448 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 18491624448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28722193920).

18491624448 is an abundant number, since it is smaller than the sum of its proper divisors (38952763392).

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

18491624448 is a wasteful number, since it uses less digits than its factorization.

18491624448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 465 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 51.

The spelling of 18491624448 in words is "eighteen billion, four hundred ninety-one million, six hundred twenty-four thousand, four hundred forty-eight".