19713634449 has 16 divisors (see below), whose sum is σ = 26346845184. Its totient is φ = 13111459200.

The previous prime is 19713634387. The next prime is 19713634453. The reversal of 19713634449 is 94443631791.

It is not a de Polignac number, because 19713634449 - 2⁷ = 19713634321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19713634649) 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 15 ways as a sum of consecutive naturals, for example, 2878269 + ... + 2885109.

It is an arithmetic number, because the mean of its divisors is an integer number (1646677824).

Almost surely, 2^19713634449 is an apocalyptic number.

It is an amenable number.

19713634449 is a deficient number, since it is larger than the sum of its proper divisors (6633210735).

19713634449 is a wasteful number, since it uses less digits than its factorization.

19713634449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8968.

The product of its digits is 1959552, while the sum is 51.

The spelling of 19713634449 in words is "nineteen billion, seven hundred thirteen million, six hundred thirty-four thousand, four hundred forty-nine".