20155443289 has 2 divisors, whose sum is σ = 20155443290. Its totient is φ = 20155443288.

The previous prime is 20155443251. The next prime is 20155443317. The reversal of 20155443289 is 98234455102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11715897600 + 8439545689 = 108240^2 + 91867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20155443289 is a prime.

It is not a weakly prime, because it can be changed into another prime (20155443229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10077721644 + 10077721645.

It is an arithmetic number, because the mean of its divisors is an integer number (10077721645).

Almost surely, 2^20155443289 is an apocalyptic number.

It is an amenable number.

20155443289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20155443289 is an equidigital number, since it uses as much as digits as its factorization.

20155443289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 20155443289 in words is "twenty billion, one hundred fifty-five million, four hundred forty-three thousand, two hundred eighty-nine".