20430231561959 has 2 divisors, whose sum is σ = 20430231561960. Its totient is φ = 20430231561958.

The previous prime is 20430231561953. The next prime is 20430231562031. The reversal of 20430231561959 is 95916513203402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20430231561959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20430231561953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215115780979 + 10215115780980.

It is an arithmetic number, because the mean of its divisors is an integer number (10215115780980).

Almost surely, 2^{20430231561959} is an apocalyptic number.

20430231561959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430231561959 is an equidigital number, since it uses as much as digits as its factorization.

20430231561959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1749600, while the sum is 50.

The spelling of 20430231561959 in words is "twenty trillion, four hundred thirty billion, two hundred thirty-one million, five hundred sixty-one thousand, nine hundred fifty-nine".