172166617 has 12 divisors (see below), whose sum is σ = 199778880. Its totient is φ = 145342296.

The previous prime is 172166611. The next prime is 172166639. The reversal of 172166617 is 716661271.

It is a de Polignac number, because none of the positive numbers 2^k-172166617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172166611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28684 + ... + 34162.

It is an arithmetic number, because the mean of its divisors is an integer number (16648240).

Almost surely, 2^172166617 is an apocalyptic number.

It is an amenable number.

172166617 is a deficient number, since it is larger than the sum of its proper divisors (27612263).

172166617 is an frugal number, since it uses more digits than its factorization.

172166617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5620 (or 5553 counting only the distinct ones).

The product of its digits is 21168, while the sum is 37.

The square root of 172166617 is about 13121.2277245691. The cubic root of 172166617 is about 556.3092936499.

The spelling of 172166617 in words is "one hundred seventy-two million, one hundred sixty-six thousand, six hundred seventeen".