18197171696 has 80 divisors (see below), whose sum is σ = 39498471936. Its totient is φ = 8049600000.

The previous prime is 18197171669. The next prime is 18197171747. The reversal of 18197171696 is 69617179181.

It is a super-2 number, since 2×18197171696² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3107171 + ... + 3113021.

Almost surely, 2^18197171696 is an apocalyptic number.

18197171696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18197171696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19749235968).

18197171696 is an abundant number, since it is smaller than the sum of its proper divisors (21301300240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18197171696 is a wasteful number, since it uses less digits than its factorization.

18197171696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6342 (or 6336 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 56.

The spelling of 18197171696 in words is "eighteen billion, one hundred ninety-seven million, one hundred seventy-one thousand, six hundred ninety-six".