166023225 has 27 divisors (see below), whose sum is σ = 297712623. Its totient is φ = 88442640.

The previous prime is 166023167. The next prime is 166023229. The reversal of 166023225 is 522320661.

The square root of 166023225 is 12885.

It is a perfect power (a square), and thus also a powerful number.

166023225 is a `hidden beast` number, since 1 + 6 + 602 + 32 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 59768361 + 106254864 = 7731^2 + 10308^2 .

It is not a de Polignac number, because 166023225 - 2¹³ = 166015033 is a prime.

It is a super-2 number, since 2×166023225² = 55127422478801250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166023229) 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 26 ways as a sum of consecutive naturals, for example, 192846 + ... + 193704.

Almost surely, 2^166023225 is an apocalyptic number.

166023225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166023225 is the 12885-th square number.

166023225 is the 6443-rd centered octagonal number.

It is an amenable number.

166023225 is a deficient number, since it is larger than the sum of its proper divisors (131689398).

166023225 is an frugal number, since it uses more digits than its factorization.

166023225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The cubic root of 166023225 is about 549.6120956289.

Adding to 166023225 its reverse (522320661), we get a palindrome (688343886).

The spelling of 166023225 in words is "one hundred sixty-six million, twenty-three thousand, two hundred twenty-five".