19645134223 has 8 divisors (see below), whose sum is σ = 23079598416. Its totient is φ = 16485427200.

The previous prime is 19645134211. The next prime is 19645134251. The reversal of 19645134223 is 32243154691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19645134223 - 2²⁵ = 19611579791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19645134263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68689138 + ... + 68689423.

It is an arithmetic number, because the mean of its divisors is an integer number (2884949802).

Almost surely, 2^19645134223 is an apocalyptic number.

19645134223 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19645134223 is a deficient number, since it is larger than the sum of its proper divisors (3434464193).

19645134223 is a wasteful number, since it uses less digits than its factorization.

19645134223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137378585.

The product of its digits is 155520, while the sum is 40.

The spelling of 19645134223 in words is "nineteen billion, six hundred forty-five million, one hundred thirty-four thousand, two hundred twenty-three".