20859173596823 has 2 divisors, whose sum is σ = 20859173596824. Its totient is φ = 20859173596822.

The previous prime is 20859173596771. The next prime is 20859173596853. The reversal of 20859173596823 is 32869537195802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20859173596823 - 2⁶ = 20859173596759 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20859173596853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429586798411 + 10429586798412.

It is an arithmetic number, because the mean of its divisors is an integer number (10429586798412).

Almost surely, 2^{20859173596823} is an apocalyptic number.

20859173596823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20859173596823 is an equidigital number, since it uses as much as digits as its factorization.

20859173596823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 195955200, while the sum is 68.

The spelling of 20859173596823 in words is "twenty trillion, eight hundred fifty-nine billion, one hundred seventy-three million, five hundred ninety-six thousand, eight hundred twenty-three".