166531250 has 42 divisors (see below), whose sum is σ = 316577979. Its totient is φ = 65700000.

The previous prime is 166531237. The next prime is 166531273. The reversal of 166531250 is 52135661.

It can be written as a sum of positive squares in 11 ways, for example, as 137898049 + 28633201 = 11743^2 + 5351^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9125.

It is a Duffinian number.

It is an unprimeable number.

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 20 ways as a sum of consecutive naturals, for example, 2281214 + ... + 2281286.

Almost surely, 2^166531250 is an apocalyptic number.

166531250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166531250 is a deficient number, since it is larger than the sum of its proper divisors (150046729).

166531250 is an frugal number, since it uses more digits than its factorization.

166531250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 166531250 is about 12904.6987566545. The cubic root of 166531250 is about 550.1721224372.

The spelling of 166531250 in words is "one hundred sixty-six million, five hundred thirty-one thousand, two hundred fifty".