172166555 has 16 divisors (see below), whose sum is σ = 225897984. Its totient is φ = 124925280.

The previous prime is 172166549. The next prime is 172166557. The reversal of 172166555 is 555661271.

It is not a de Polignac number, because 172166555 - 2⁸ = 172166299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172166557) 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 15 ways as a sum of consecutive naturals, for example, 22334 + ... + 29036.

It is an arithmetic number, because the mean of its divisors is an integer number (14118624).

Almost surely, 2^172166555 is an apocalyptic number.

172166555 is a deficient number, since it is larger than the sum of its proper divisors (53731429).

172166555 is a wasteful number, since it uses less digits than its factorization.

172166555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7186.

The product of its digits is 63000, while the sum is 38.

The square root of 172166555 is about 13121.2253619851. The cubic root of 172166555 is about 556.3092268712.

The spelling of 172166555 in words is "one hundred seventy-two million, one hundred sixty-six thousand, five hundred fifty-five".