19680043745 has 16 divisors (see below), whose sum is σ = 24124635648. Its totient is φ = 15405149760.

The previous prime is 19680043723. The next prime is 19680043777. The reversal of 19680043745 is 54734008691.

It is not a de Polignac number, because 19680043745 - 2¹⁴ = 19680027361 is a prime.

It is a super-3 number, since 3×19680043745³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19680043745.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1222700 + ... + 1238690.

It is an arithmetic number, because the mean of its divisors is an integer number (1507789728).

Almost surely, 2^19680043745 is an apocalyptic number.

It is an amenable number.

19680043745 is a deficient number, since it is larger than the sum of its proper divisors (4444591903).

19680043745 is a wasteful number, since it uses less digits than its factorization.

19680043745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21280.

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 19680043745 in words is "nineteen billion, six hundred eighty million, forty-three thousand, seven hundred forty-five".