19717045449 has 16 divisors (see below), whose sum is σ = 27101227200. Its totient is φ = 12744884736.

The previous prime is 19717045441. The next prime is 19717045483. The reversal of 19717045449 is 94454071791.

It is not a de Polignac number, because 19717045449 - 2³ = 19717045441 is a prime.

It is a super-2 number, since 2×19717045449² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19717045441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750064 + ... + 775905.

It is an arithmetic number, because the mean of its divisors is an integer number (1693826700).

Almost surely, 2^19717045449 is an apocalyptic number.

It is an amenable number.

19717045449 is a deficient number, since it is larger than the sum of its proper divisors (7384181751).

19717045449 is a wasteful number, since it uses less digits than its factorization.

19717045449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526104.

The product of its (nonzero) digits is 1270080, while the sum is 51.

The spelling of 19717045449 in words is "nineteen billion, seven hundred seventeen million, forty-five thousand, four hundred forty-nine".