19049799785 has 4 divisors (see below), whose sum is σ = 22859759748. Its totient is φ = 15239839824.

The previous prime is 19049799781. The next prime is 19049799829. The reversal of 19049799785 is 58799794091.

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 9973617424 + 9076182361 = 99868^2 + 95269^2 .

It is a cyclic number.

It is not a de Polignac number, because 19049799785 - 2² = 19049799781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19049799781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1904979974 + ... + 1904979983.

It is an arithmetic number, because the mean of its divisors is an integer number (5714939937).

Almost surely, 2^19049799785 is an apocalyptic number.

It is an amenable number.

19049799785 is a deficient number, since it is larger than the sum of its proper divisors (3809959963).

19049799785 is an equidigital number, since it uses as much as digits as its factorization.

19049799785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3809959962.

The product of its (nonzero) digits is 51438240, while the sum is 68.

The spelling of 19049799785 in words is "nineteen billion, forty-nine million, seven hundred ninety-nine thousand, seven hundred eighty-five".