19809428961243 has 8 divisors (see below), whose sum is σ = 26473570961488. Its totient is φ = 13175786467584.

The previous prime is 19809428961181. The next prime is 19809428961277. The reversal of 19809428961243 is 34216982490891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19809428961243 - 2⁸ = 19809428960987 is a prime.

It is a super-2 number, since 2×19809428961243² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19809428961293) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7624875130 + ... + 7624877727.

It is an arithmetic number, because the mean of its divisors is an integer number (3309196370186).

Almost surely, 2^{19809428961243} is an apocalyptic number.

19809428961243 is a deficient number, since it is larger than the sum of its proper divisors (6664142000245).

19809428961243 is a wasteful number, since it uses less digits than its factorization.

19809428961243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15249753293.

The product of its (nonzero) digits is 53747712, while the sum is 66.

The spelling of 19809428961243 in words is "nineteen trillion, eight hundred nine billion, four hundred twenty-eight million, nine hundred sixty-one thousand, two hundred forty-three".