166641215 has 8 divisors (see below), whose sum is σ = 215351808. Its totient is φ = 123058080.

The previous prime is 166641199. The next prime is 166641217. The reversal of 166641215 is 512146661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166641215 - 2⁴ = 166641199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166641217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281791 + ... + 1281920.

It is an arithmetic number, because the mean of its divisors is an integer number (26918976).

Almost surely, 2^166641215 is an apocalyptic number.

166641215 is a deficient number, since it is larger than the sum of its proper divisors (48710593).

166641215 is a wasteful number, since it uses less digits than its factorization.

166641215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563729.

The product of its digits is 8640, while the sum is 32.

The square root of 166641215 is about 12908.9587109108. The cubic root of 166641215 is about 550.2931935391.

Adding to 166641215 its reverse (512146661), we get a palindrome (678787876).

The spelling of 166641215 in words is "one hundred sixty-six million, six hundred forty-one thousand, two hundred fifteen".