19519943442 has 32 divisors (see below), whose sum is σ = 40778225280. Its totient is φ = 6221281920.

The previous prime is 19519943411. The next prime is 19519943459. The reversal of 19519943442 is 24434991591.

It is a happy number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 526659 + ... + 562502.

It is an arithmetic number, because the mean of its divisors is an integer number (1274319540).

Almost surely, 2^19519943442 is an apocalyptic number.

19519943442 is an abundant number, since it is smaller than the sum of its proper divisors (21258281838).

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

19519943442 is a wasteful number, since it uses less digits than its factorization.

19519943442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089298.

The product of its digits is 1399680, while the sum is 51.

The spelling of 19519943442 in words is "nineteen billion, five hundred nineteen million, nine hundred forty-three thousand, four hundred forty-two".