18197171697 has 4 divisors (see below), whose sum is σ = 24262895600. Its totient is φ = 12131447796.

The previous prime is 18197171669. The next prime is 18197171747. The reversal of 18197171697 is 79617179181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 79617179181 = 3 ⋅26539059727.

It is not a de Polignac number, because 18197171697 - 2¹² = 18197167601 is a prime.

It is a super-2 number, since 2×18197171697² (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 (18197171627) 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, 3032861947 + ... + 3032861952.

It is an arithmetic number, because the mean of its divisors is an integer number (6065723900).

Almost surely, 2^18197171697 is an apocalyptic number.

It is an amenable number.

18197171697 is a deficient number, since it is larger than the sum of its proper divisors (6065723903).

18197171697 is an equidigital number, since it uses as much as digits as its factorization.

18197171697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6065723902.

The product of its digits is 1333584, while the sum is 57.

The spelling of 18197171697 in words is "eighteen billion, one hundred ninety-seven million, one hundred seventy-one thousand, six hundred ninety-seven".