19875642389 has 2 divisors, whose sum is σ = 19875642390. Its totient is φ = 19875642388.

The previous prime is 19875642337. The next prime is 19875642407. The reversal of 19875642389 is 98324657891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18272280625 + 1603361764 = 135175^2 + 40042^2 .

It is a cyclic number.

It is not a de Polignac number, because 19875642389 - 2³² = 15580675093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19875642889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9937821194 + 9937821195.

It is an arithmetic number, because the mean of its divisors is an integer number (9937821195).

Almost surely, 2^19875642389 is an apocalyptic number.

It is an amenable number.

19875642389 is a deficient number, since it is larger than the sum of its proper divisors (1).

19875642389 is an equidigital number, since it uses as much as digits as its factorization.

19875642389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 62.

The spelling of 19875642389 in words is "nineteen billion, eight hundred seventy-five million, six hundred forty-two thousand, three hundred eighty-nine".