18168232177 has 4 divisors (see below), whose sum is σ = 18172990836. Its totient is φ = 18163473520.

The previous prime is 18168232141. The next prime is 18168232219. The reversal of 18168232177 is 77123286181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77123286181 = 17 ⋅4536663893.

It can be written as a sum of positive squares in 2 ways, for example, as 17141093776 + 1027138401 = 130924^2 + 32049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18168232177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18168233177) 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, 2373598 + ... + 2381239.

It is an arithmetic number, because the mean of its divisors is an integer number (4543247709).

Almost surely, 2^18168232177 is an apocalyptic number.

It is an amenable number.

18168232177 is a deficient number, since it is larger than the sum of its proper divisors (4758659).

18168232177 is an equidigital number, since it uses as much as digits as its factorization.

18168232177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758658.

The product of its digits is 225792, while the sum is 46.

The spelling of 18168232177 in words is "eighteen billion, one hundred sixty-eight million, two hundred thirty-two thousand, one hundred seventy-seven".