20004356657573 has 2 divisors, whose sum is σ = 20004356657574. Its totient is φ = 20004356657572.

The previous prime is 20004356657531. The next prime is 20004356657617. The reversal of 20004356657573 is 37575665340002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19755118076929 + 249238580644 = 4444673^2 + 499238^2 .

It is a cyclic number.

It is not a de Polignac number, because 20004356657573 - 2¹⁶ = 20004356592037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004356627573) 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, 10002178328786 + 10002178328787.

It is an arithmetic number, because the mean of its divisors is an integer number (10002178328787).

Almost surely, 2^{20004356657573} is an apocalyptic number.

It is an amenable number.

20004356657573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004356657573 is an equidigital number, since it uses as much as digits as its factorization.

20004356657573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876000, while the sum is 53.

The spelling of 20004356657573 in words is "twenty trillion, four billion, three hundred fifty-six million, six hundred fifty-seven thousand, five hundred seventy-three".