18735594169 has 2 divisors, whose sum is σ = 18735594170. Its totient is φ = 18735594168.

The previous prime is 18735594167. The next prime is 18735594221. The reversal of 18735594169 is 96149553781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18066854569 + 668739600 = 134413^2 + 25860^2 .

It is an emirp because it is prime and its reverse (96149553781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18735594169 - 2¹ = 18735594167 is a prime.

It is a super-2 number, since 2×18735594169² (a number of 21 digits) contains 22 as substring.

Together with 18735594167, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18735594167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9367797084 + 9367797085.

It is an arithmetic number, because the mean of its divisors is an integer number (9367797085).

Almost surely, 2^18735594169 is an apocalyptic number.

It is an amenable number.

18735594169 is a deficient number, since it is larger than the sum of its proper divisors (1).

18735594169 is an equidigital number, since it uses as much as digits as its factorization.

18735594169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8164800, while the sum is 58.

The spelling of 18735594169 in words is "eighteen billion, seven hundred thirty-five million, five hundred ninety-four thousand, one hundred sixty-nine".