20180537202173 has 2 divisors, whose sum is σ = 20180537202174. Its totient is φ = 20180537202172.

The previous prime is 20180537202143. The next prime is 20180537202233. The reversal of 20180537202173 is 37120273508102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19750362563044 + 430174639129 = 4444138^2 + 655877^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20180537202173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20180537202173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20180537202143) 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, 10090268601086 + 10090268601087.

It is an arithmetic number, because the mean of its divisors is an integer number (10090268601087).

Almost surely, 2^{20180537202173} is an apocalyptic number.

It is an amenable number.

20180537202173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20180537202173 is an equidigital number, since it uses as much as digits as its factorization.

20180537202173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 20180537202173 in words is "twenty trillion, one hundred eighty billion, five hundred thirty-seven million, two hundred two thousand, one hundred seventy-three".