166277225 has 12 divisors (see below), whose sum is σ = 208796160. Its totient is φ = 131336400.

The previous prime is 166277197. The next prime is 166277233. The reversal of 166277225 is 522772661.

It is a happy number.

It is not a de Polignac number, because 166277225 - 2⁶ = 166277161 is a prime.

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 40121 + ... + 44070.

It is an arithmetic number, because the mean of its divisors is an integer number (17399680).

Almost surely, 2^166277225 is an apocalyptic number.

It is an amenable number.

166277225 is a deficient number, since it is larger than the sum of its proper divisors (42518935).

166277225 is an equidigital number, since it uses as much as digits as its factorization.

166277225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84280 (or 84275 counting only the distinct ones).

The product of its digits is 70560, while the sum is 38.

The square root of 166277225 is about 12894.8526552264. The cubic root of 166277225 is about 549.8922378406.

It can be divided in two parts, 1662 and 77225, that added together give a palindrome (78887).

The spelling of 166277225 in words is "one hundred sixty-six million, two hundred seventy-seven thousand, two hundred twenty-five".