19744798894144 has 21 divisors (see below), whose sum is σ = 39181155846447. Its totient is φ = 9872381673024.

The previous prime is 19744798894141. The next prime is 19744798894193. The reversal of 19744798894144 is 44149889744791.

The square root of 19744798894144 is 4443512.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19744798894141) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 35270377 + ... + 35825815.

Almost surely, 2^{19744798894144} is an apocalyptic number.

19744798894144 is the 4443512-nd square number.

It is an amenable number.

19744798894144 is a deficient number, since it is larger than the sum of its proper divisors (19436356952303).

19744798894144 is an frugal number, since it uses more digits than its factorization.

19744798894144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110890 (or 555441 counting only the distinct ones).

The product of its digits is 2341011456, while the sum is 79.

The spelling of 19744798894144 in words is "nineteen trillion, seven hundred forty-four billion, seven hundred ninety-eight million, eight hundred ninety-four thousand, one hundred forty-four".