19574820449 has 4 divisors (see below), whose sum is σ = 19694911536. Its totient is φ = 19454729364.

The previous prime is 19574820431. The next prime is 19574820457. The reversal of 19574820449 is 94402847591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19574820449 - 2²⁰ = 19573771873 is a prime.

It is a super-2 number, since 2×19574820449² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19574820449.

It is not an unprimeable number, because it can be changed into a prime (19574820149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60045299 + ... + 60045624.

It is an arithmetic number, because the mean of its divisors is an integer number (4923727884).

Almost surely, 2^19574820449 is an apocalyptic number.

It is an amenable number.

19574820449 is a deficient number, since it is larger than the sum of its proper divisors (120091087).

19574820449 is a wasteful number, since it uses less digits than its factorization.

19574820449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120091086.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 19574820449 in words is "nineteen billion, five hundred seventy-four million, eight hundred twenty thousand, four hundred forty-nine".