18209163969 has 12 divisors (see below), whose sum is σ = 27686448400. Its totient is φ = 11500524504.

The previous prime is 18209163953. The next prime is 18209164031. The reversal of 18209163969 is 96936190281.

It is not a de Polignac number, because 18209163969 - 2⁴ = 18209163953 is a prime.

It is a super-2 number, since 2×18209163969² (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 (18209163919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53242999 + ... + 53243340.

Almost surely, 2^18209163969 is an apocalyptic number.

18209163969 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18209163969 is a deficient number, since it is larger than the sum of its proper divisors (9477284431).

18209163969 is a wasteful number, since it uses less digits than its factorization.

18209163969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106486364 (or 106486361 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 18209163969 in words is "eighteen billion, two hundred nine million, one hundred sixty-three thousand, nine hundred sixty-nine".