166186841 has 4 divisors (see below), whose sum is σ = 166255284. Its totient is φ = 166118400.

The previous prime is 166186829. The next prime is 166186843. The reversal of 166186841 is 148681661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2449225 + 163737616 = 1565^2 + 12796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166186841 is a prime.

It is a super-2 number, since 2×166186841² = 55236132243118562, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166186843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30440 + ... + 35481.

It is an arithmetic number, because the mean of its divisors is an integer number (41563821).

Almost surely, 2^166186841 is an apocalyptic number.

It is an amenable number.

166186841 is a deficient number, since it is larger than the sum of its proper divisors (68443).

166186841 is an equidigital number, since it uses as much as digits as its factorization.

166186841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68442.

The product of its digits is 55296, while the sum is 41.

The square root of 166186841 is about 12891.3475245996. The cubic root of 166186841 is about 549.7925840481.

The spelling of 166186841 in words is "one hundred sixty-six million, one hundred eighty-six thousand, eight hundred forty-one".