172543493438 has 8 divisors (see below), whose sum is σ = 258822613632. Its totient is φ = 86269288896.

The previous prime is 172543493431. The next prime is 172543493491. The reversal of 172543493438 is 834394345271.

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

It is a self number, because there is not a number n which added to its sum of digits gives 172543493438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172543493431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139870 + ... + 1282337.

It is an arithmetic number, because the mean of its divisors is an integer number (32352826704).

Almost surely, 2^172543493438 is an apocalyptic number.

172543493438 is a deficient number, since it is larger than the sum of its proper divisors (86279120194).

172543493438 is a wasteful number, since it uses less digits than its factorization.

172543493438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457826.

The product of its digits is 8709120, while the sum is 53.

The spelling of 172543493438 in words is "one hundred seventy-two billion, five hundred forty-three million, four hundred ninety-three thousand, four hundred thirty-eight".