19519347145 has 8 divisors (see below), whose sum is σ = 23478856200. Its totient is φ = 15578384640.

The previous prime is 19519347143. The next prime is 19519347149. The reversal of 19519347145 is 54174391591.

It can be written as a sum of positive squares in 4 ways, for example, as 199459129 + 19319888016 = 14123^2 + 138996^2 .

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

It is not a de Polignac number, because 19519347145 - 2¹ = 19519347143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19519347143) 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 7 ways as a sum of consecutive naturals, for example, 4634320 + ... + 4638529.

It is an arithmetic number, because the mean of its divisors is an integer number (2934857025).

Almost surely, 2^19519347145 is an apocalyptic number.

It is an amenable number.

19519347145 is a deficient number, since it is larger than the sum of its proper divisors (3959509055).

19519347145 is an equidigital number, since it uses as much as digits as its factorization.

19519347145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9273275.

The product of its digits is 680400, while the sum is 49.

The spelling of 19519347145 in words is "nineteen billion, five hundred nineteen million, three hundred forty-seven thousand, one hundred forty-five".