18936568169 has 4 divisors (see below), whose sum is σ = 18937062144. Its totient is φ = 18936074196.

The previous prime is 18936568121. The next prime is 18936568171. The reversal of 18936568169 is 96186563981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18936568169 - 2⁸ = 18936567913 is a prime.

It is a super-2 number, since 2×18936568169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18936568199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184157 + ... + 267930.

It is an arithmetic number, because the mean of its divisors is an integer number (4734265536).

Almost surely, 2^18936568169 is an apocalyptic number.

It is an amenable number.

18936568169 is a deficient number, since it is larger than the sum of its proper divisors (493975).

18936568169 is an equidigital number, since it uses as much as digits as its factorization.

18936568169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493974.

The product of its digits is 16796160, while the sum is 62.

The spelling of 18936568169 in words is "eighteen billion, nine hundred thirty-six million, five hundred sixty-eight thousand, one hundred sixty-nine".