166539027 has 4 divisors (see below), whose sum is σ = 222052040. Its totient is φ = 111026016.

The previous prime is 166539017. The next prime is 166539041. The reversal of 166539027 is 720935661.

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

It is not a de Polignac number, because 166539027 - 2⁴ = 166539011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166539017) 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, 27756502 + ... + 27756507.

It is an arithmetic number, because the mean of its divisors is an integer number (55513010).

Almost surely, 2^166539027 is an apocalyptic number.

166539027 is a deficient number, since it is larger than the sum of its proper divisors (55513013).

166539027 is an equidigital number, since it uses as much as digits as its factorization.

166539027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55513012.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 166539027 is about 12905.0000774893. Note that the first 4 decimals coincide. The cubic root of 166539027 is about 550.1806866396.

The spelling of 166539027 in words is "one hundred sixty-six million, five hundred thirty-nine thousand, twenty-seven".