166173285 has 32 divisors (see below), whose sum is σ = 277250688. Its totient is φ = 84913920.

The previous prime is 166173263. The next prime is 166173289. The reversal of 166173285 is 582371661.

It is not a de Polignac number, because 166173285 - 2¹⁴ = 166156901 is a prime.

It is a super-2 number, since 2×166173285² = 55227121295382450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166173289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31755 + ... + 36615.

It is an arithmetic number, because the mean of its divisors is an integer number (8664084).

Almost surely, 2^166173285 is an apocalyptic number.

166173285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166173285 is a deficient number, since it is larger than the sum of its proper divisors (111077403).

166173285 is a wasteful number, since it uses less digits than its factorization.

166173285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4965.

The product of its digits is 60480, while the sum is 39.

The square root of 166173285 is about 12890.8217348624. The cubic root of 166173285 is about 549.7776346276. Note that the first 3 decimals are identical.

The spelling of 166173285 in words is "one hundred sixty-six million, one hundred seventy-three thousand, two hundred eighty-five".