172031743018 has 4 divisors (see below), whose sum is σ = 258047614530. Its totient is φ = 86015871508.

The previous prime is 172031743007. The next prime is 172031743019. The reversal of 172031743018 is 810347130271.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 158760011809 + 13271731209 = 398447^2 + 115203^2 .

It is a super-2 number, since 2×172031743018² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172031743019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43007935753 + ... + 43007935756.

Almost surely, 2^172031743018 is an apocalyptic number.

172031743018 is a deficient number, since it is larger than the sum of its proper divisors (86015871512).

172031743018 is an equidigital number, since it uses as much as digits as its factorization.

172031743018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86015871511.

The product of its (nonzero) digits is 28224, while the sum is 37.

Adding to 172031743018 its reverse (810347130271), we get a palindrome (982378873289).

The spelling of 172031743018 in words is "one hundred seventy-two billion, thirty-one million, seven hundred forty-three thousand, eighteen".