19443416861 has 16 divisors (see below), whose sum is σ = 21790762560. Its totient is φ = 17192983680.

The previous prime is 19443416849. The next prime is 19443416891. The reversal of 19443416861 is 16861434491.

It is a cyclic number.

It is not a de Polignac number, because 19443416861 - 2¹⁰ = 19443415837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19443416801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2200310 + ... + 2209128.

It is an arithmetic number, because the mean of its divisors is an integer number (1361922660).

Almost surely, 2^19443416861 is an apocalyptic number.

19443416861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19443416861 is a deficient number, since it is larger than the sum of its proper divisors (2347345699).

19443416861 is a wasteful number, since it uses less digits than its factorization.

19443416861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14284.

The product of its digits is 497664, while the sum is 47.

The spelling of 19443416861 in words is "nineteen billion, four hundred forty-three million, four hundred sixteen thousand, eight hundred sixty-one".