171888720172 has 12 divisors (see below), whose sum is σ = 323944126576. Its totient is φ = 79333255440.

The previous prime is 171888720161. The next prime is 171888720197. The reversal of 171888720172 is 271027888171.

171888720172 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 3305552311 = 171888720172 / (1 + 7 + 1 + 8 + 8 + 8 + 7 + 2 + 0 + 1 + 7 + 2).

It is an unprimeable number.

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, 1652776104 + ... + 1652776207.

Almost surely, 2^171888720172 is an apocalyptic number.

It is an amenable number.

171888720172 is a deficient number, since it is larger than the sum of its proper divisors (152055406404).

171888720172 is a wasteful number, since it uses less digits than its factorization.

171888720172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305552328 (or 3305552326 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 52.

The spelling of 171888720172 in words is "one hundred seventy-one billion, eight hundred eighty-eight million, seven hundred twenty thousand, one hundred seventy-two".