171687203423 has 4 divisors (see below), whose sum is σ = 175679929128. Its totient is φ = 167694477720.

The previous prime is 171687203417. The next prime is 171687203461. The reversal of 171687203423 is 324302786171.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 171687203423 - 2⁴ = 171687203407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171687200423) 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, 1996362788 + ... + 1996362873.

It is an arithmetic number, because the mean of its divisors is an integer number (43919982282).

Almost surely, 2^171687203423 is an apocalyptic number.

171687203423 is a deficient number, since it is larger than the sum of its proper divisors (3992725705).

171687203423 is an equidigital number, since it uses as much as digits as its factorization.

171687203423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3992725704.

The product of its (nonzero) digits is 338688, while the sum is 44.

Adding to 171687203423 its reverse (324302786171), we get a palindrome (495989989594).

The spelling of 171687203423 in words is "one hundred seventy-one billion, six hundred eighty-seven million, two hundred three thousand, four hundred twenty-three".