19644134613 has 16 divisors (see below), whose sum is σ = 26588638656. Its totient is φ = 12897941760.

The previous prime is 19644134611. The next prime is 19644134623. The reversal of 19644134613 is 31643144691.

It is not a de Polignac number, because 19644134613 - 2¹ = 19644134611 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19644134611) 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 15 ways as a sum of consecutive naturals, for example, 1560123 + ... + 1572663.

It is an arithmetic number, because the mean of its divisors is an integer number (1661789916).

Almost surely, 2^19644134613 is an apocalyptic number.

It is an amenable number.

19644134613 is a deficient number, since it is larger than the sum of its proper divisors (6944504043).

19644134613 is a wasteful number, since it uses less digits than its factorization.

19644134613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20404.

The product of its digits is 186624, while the sum is 42.

The spelling of 19644134613 in words is "nineteen billion, six hundred forty-four million, one hundred thirty-four thousand, six hundred thirteen".