19491014448 has 90 divisors (see below), whose sum is σ = 56593333524. Its totient is φ = 6494103072.

The previous prime is 19491014429. The next prime is 19491014449. The reversal of 19491014448 is 84441019491.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

19491014448 is a `hidden beast` number, since 19 + 491 + 0 + 144 + 4 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (19491014449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8704113 + ... + 8706351.

Almost surely, 2^19491014448 is an apocalyptic number.

19491014448 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 19491014448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28296666762).

19491014448 is an abundant number, since it is smaller than the sum of its proper divisors (37102319076).

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

19491014448 is an frugal number, since it uses more digits than its factorization.

19491014448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501 (or 2244 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 19491014448 in words is "nineteen billion, four hundred ninety-one million, fourteen thousand, four hundred forty-eight".