20434542025489 has 2 divisors, whose sum is σ = 20434542025490. Its totient is φ = 20434542025488.

The previous prime is 20434542025439. The next prime is 20434542025537. The reversal of 20434542025489 is 98452024543402.

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., 16694031303889 + 3740510721600 = 4085833^2 + 1934040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20434542025489 is a prime.

It is not a weakly prime, because it can be changed into another prime (20434542025439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217271012744 + 10217271012745.

It is an arithmetic number, because the mean of its divisors is an integer number (10217271012745).

Almost surely, 2^{20434542025489} is an apocalyptic number.

It is an amenable number.

20434542025489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434542025489 is an equidigital number, since it uses as much as digits as its factorization.

20434542025489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11059200, while the sum is 52.

The spelling of 20434542025489 in words is "twenty trillion, four hundred thirty-four billion, five hundred forty-two million, twenty-five thousand, four hundred eighty-nine".