19449716544 has 56 divisors (see below), whose sum is σ = 57178569920. Its totient is φ = 6483238272.

The previous prime is 19449716509. The next prime is 19449716557. The reversal of 19449716544 is 44561794491.

It is a happy number.

19449716544 is a `hidden beast` number, since 1 + 9 + 4 + 4 + 97 + 1 + 6 + 544 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5626084 + ... + 5629539.

Almost surely, 2^19449716544 is an apocalyptic number.

It is an amenable number.

19449716544 is an abundant number, since it is smaller than the sum of its proper divisors (37728853376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19449716544 is a wasteful number, since it uses less digits than its factorization.

19449716544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11255644 (or 11255628 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 19449716544 in words is "nineteen billion, four hundred forty-nine million, seven hundred sixteen thousand, five hundred forty-four".