19715443961 has 4 divisors (see below), whose sum is σ = 19721680272. Its totient is φ = 19709207652.

The previous prime is 19715443933. The next prime is 19715444003. The reversal of 19715443961 is 16934451791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19715443961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19715443901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3113411 + ... + 3119736.

It is an arithmetic number, because the mean of its divisors is an integer number (4930420068).

Almost surely, 2^19715443961 is an apocalyptic number.

It is an amenable number.

19715443961 is a deficient number, since it is larger than the sum of its proper divisors (6236311).

19715443961 is an equidigital number, since it uses as much as digits as its factorization.

19715443961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6236310.

The product of its digits is 816480, while the sum is 50.

The spelling of 19715443961 in words is "nineteen billion, seven hundred fifteen million, four hundred forty-three thousand, nine hundred sixty-one".