19882386644 has 6 divisors (see below), whose sum is σ = 34794176634. Its totient is φ = 9941193320.

The previous prime is 19882386611. The next prime is 19882386647. The reversal of 19882386644 is 44668328891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15787922500 + 4094464144 = 125650^2 + 63988^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19882386647) 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 as a sum of consecutive naturals, namely, 2485298327 + ... + 2485298334.

It is an arithmetic number, because the mean of its divisors is an integer number (5799029439).

Almost surely, 2^19882386644 is an apocalyptic number.

It is an amenable number.

19882386644 is a deficient number, since it is larger than the sum of its proper divisors (14911789990).

19882386644 is a wasteful number, since it uses less digits than its factorization.

19882386644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4970596665 (or 4970596663 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 59.

The spelling of 19882386644 in words is "nineteen billion, eight hundred eighty-two million, three hundred eighty-six thousand, six hundred forty-four".