166145215 has 16 divisors (see below), whose sum is σ = 218995200. Its totient is φ = 120444192.

The previous prime is 166145191. The next prime is 166145279. The reversal of 166145215 is 512541661.

It is not a de Polignac number, because 166145215 - 2⁷ = 166145087 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35835 + ... + 40204.

It is an arithmetic number, because the mean of its divisors is an integer number (13687200).

Almost surely, 2^166145215 is an apocalyptic number.

166145215 is a deficient number, since it is larger than the sum of its proper divisors (52849985).

166145215 is a wasteful number, since it uses less digits than its factorization.

166145215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76086.

The product of its digits is 7200, while the sum is 31.

The square root of 166145215 is about 12889.7329297391. The cubic root of 166145215 is about 549.7466767287.

Adding to 166145215 its reverse (512541661), we get a palindrome (678686876).

The spelling of 166145215 in words is "one hundred sixty-six million, one hundred forty-five thousand, two hundred fifteen".