18520169137 has 2 divisors, whose sum is σ = 18520169138. Its totient is φ = 18520169136.

The previous prime is 18520169039. The next prime is 18520169183. The reversal of 18520169137 is 73196102581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15539118336 + 2981050801 = 124656^2 + 54599^2 .

It is a cyclic number.

It is not a de Polignac number, because 18520169137 - 2¹¹ = 18520167089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18520169093 and 18520169102.

It is not a weakly prime, because it can be changed into another prime (18520169537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9260084568 + 9260084569.

It is an arithmetic number, because the mean of its divisors is an integer number (9260084569).

Almost surely, 2^18520169137 is an apocalyptic number.

It is an amenable number.

18520169137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18520169137 is an equidigital number, since it uses as much as digits as its factorization.

18520169137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 18520169137 in words is "eighteen billion, five hundred twenty million, one hundred sixty-nine thousand, one hundred thirty-seven".