19018744729 has 4 divisors (see below), whose sum is σ = 19232438580. Its totient is φ = 18805050880.

The previous prime is 19018744711. The next prime is 19018744769. The reversal of 19018744729 is 92744781091.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8208360000 + 10810384729 = 90600^2 + 103973^2 .

It is a cyclic number.

It is not a de Polignac number, because 19018744729 - 2¹¹ = 19018742681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19018744709) 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 in 3 ways as a sum of consecutive naturals, for example, 106846792 + ... + 106846969.

It is an arithmetic number, because the mean of its divisors is an integer number (4808109645).

Almost surely, 2^19018744729 is an apocalyptic number.

It is an amenable number.

19018744729 is a deficient number, since it is larger than the sum of its proper divisors (213693851).

19018744729 is an equidigital number, since it uses as much as digits as its factorization.

19018744729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213693850.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The spelling of 19018744729 in words is "nineteen billion, eighteen million, seven hundred forty-four thousand, seven hundred twenty-nine".