19706965543 has 2 divisors, whose sum is σ = 19706965544. Its totient is φ = 19706965542.

The previous prime is 19706965513. The next prime is 19706965559. The reversal of 19706965543 is 34556960791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19706965543 - 2¹³ = 19706957351 is a prime.

It is the 140382-nd Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19706965513) by changing a digit.

It is a nontrivial repunit in base 140381.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9853482771 + 9853482772.

It is an arithmetic number, because the mean of its divisors is an integer number (9853482772).

Almost surely, 2^19706965543 is an apocalyptic number.

19706965543 is a deficient number, since it is larger than the sum of its proper divisors (1).

19706965543 is an equidigital number, since it uses as much as digits as its factorization.

19706965543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6123600, while the sum is 55.

The spelling of 19706965543 in words is "nineteen billion, seven hundred six million, nine hundred sixty-five thousand, five hundred forty-three".