166212125 has 16 divisors (see below), whose sum is σ = 207797616. Its totient is φ = 132736000.

The previous prime is 166212121. The next prime is 166212127. The reversal of 166212125 is 521212661.

It can be written as a sum of positive squares in 8 ways, for example, as 41242084 + 124970041 = 6422^2 + 11179^2 .

It is not a de Polignac number, because 166212125 - 2² = 166212121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166212094 and 166212103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166212121) 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, 121445 + ... + 122805.

It is an arithmetic number, because the mean of its divisors is an integer number (12987351).

Almost surely, 2^166212125 is an apocalyptic number.

It is an amenable number.

166212125 is a deficient number, since it is larger than the sum of its proper divisors (41585491).

166212125 is an equidigital number, since it uses as much as digits as its factorization.

166212125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2353 (or 2343 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 166212125 is about 12892.3281450636. The cubic root of 166212125 is about 549.8204648171.

Adding to 166212125 its reverse (521212661), we get a palindrome (687424786).

The spelling of 166212125 in words is "one hundred sixty-six million, two hundred twelve thousand, one hundred twenty-five".