19944258128 has 20 divisors (see below), whose sum is σ = 38644395648. Its totient is φ = 9971510880.

The previous prime is 19944258127. The next prime is 19944258137. The reversal of 19944258128 is 82185244991.

It is a self number, because there is not a number n which added to its sum of digits gives 19944258128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944258127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339923 + ... + 394253.

Almost surely, 2^19944258128 is an apocalyptic number.

It is an amenable number.

19944258128 is a deficient number, since it is larger than the sum of its proper divisors (18700137520).

19944258128 is a wasteful number, since it uses less digits than its factorization.

19944258128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77282 (or 77276 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 53.

The spelling of 19944258128 in words is "nineteen billion, nine hundred forty-four million, two hundred fifty-eight thousand, one hundred twenty-eight".