19719743854 has 8 divisors (see below), whose sum is σ = 29590624080. Its totient is φ = 9856202496.

The previous prime is 19719743803. The next prime is 19719743909. The reversal of 19719743854 is 45834791791.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1827994 + ... + 1838749.

It is an arithmetic number, because the mean of its divisors is an integer number (3698828010).

Almost surely, 2^19719743854 is an apocalyptic number.

19719743854 is a deficient number, since it is larger than the sum of its proper divisors (9870880226).

19719743854 is a wasteful number, since it uses less digits than its factorization.

19719743854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3669434.

The product of its digits is 7620480, while the sum is 58.

The spelling of 19719743854 in words is "nineteen billion, seven hundred nineteen million, seven hundred forty-three thousand, eight hundred fifty-four".