19974905144 has 8 divisors (see below), whose sum is σ = 37452947160. Its totient is φ = 9987452568.

The previous prime is 19974905141. The next prime is 19974905173. The reversal of 19974905144 is 44150947991.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19974905141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1248431564 + ... + 1248431579.

It is an arithmetic number, because the mean of its divisors is an integer number (4681618395).

Almost surely, 2^19974905144 is an apocalyptic number.

It is an amenable number.

19974905144 is a deficient number, since it is larger than the sum of its proper divisors (17478042016).

19974905144 is a wasteful number, since it uses less digits than its factorization.

19974905144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2496863149 (or 2496863145 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 19974905144 in words is "nineteen billion, nine hundred seventy-four million, nine hundred five thousand, one hundred forty-four".