19885836748289 has 2 divisors, whose sum is σ = 19885836748290. Its totient is φ = 19885836748288.

The previous prime is 19885836748243. The next prime is 19885836748321. The reversal of 19885836748289 is 98284763858891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19525722739264 + 360114009025 = 4418792^2 + 600095^2 .

It is a cyclic number.

It is not a de Polignac number, because 19885836748289 - 2¹⁶ = 19885836682753 is a prime.

It is a Sophie Germain prime.

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 19885836748289.

It is not a weakly prime, because it can be changed into another prime (19885836748189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9942918374144 + 9942918374145.

It is an arithmetic number, because the mean of its divisors is an integer number (9942918374145).

Almost surely, 2^{19885836748289} is an apocalyptic number.

It is an amenable number.

19885836748289 is a deficient number, since it is larger than the sum of its proper divisors (1).

19885836748289 is an equidigital number, since it uses as much as digits as its factorization.

19885836748289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13377208320, while the sum is 86.

The spelling of 19885836748289 in words is "nineteen trillion, eight hundred eighty-five billion, eight hundred thirty-six million, seven hundred forty-eight thousand, two hundred eighty-nine".