12172322158 has 8 divisors (see below), whose sum is σ = 18336846528. Its totient is φ = 6060039984.

The previous prime is 12172322111. The next prime is 12172322159. The reversal of 12172322158 is 85122327121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12172322159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13059966 + ... + 13060897.

It is an arithmetic number, because the mean of its divisors is an integer number (2292105816).

Almost surely, 2^12172322158 is an apocalyptic number.

12172322158 is a deficient number, since it is larger than the sum of its proper divisors (6164524370).

12172322158 is a wasteful number, since it uses less digits than its factorization.

12172322158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26121098.

The product of its digits is 13440, while the sum is 34.

Adding to 12172322158 its reverse (85122327121), we get a palindrome (97294649279).

The spelling of 12172322158 in words is "twelve billion, one hundred seventy-two million, three hundred twenty-two thousand, one hundred fifty-eight".