166531027 has 4 divisors (see below), whose sum is σ = 179341120. Its totient is φ = 153720936.

The previous prime is 166531019. The next prime is 166531033. The reversal of 166531027 is 720135661.

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

It is a cyclic number.

It is not a de Polignac number, because 166531027 - 2³ = 166531019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166531027.

It is not an unprimeable number, because it can be changed into a prime (166531007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6405027 + ... + 6405052.

It is an arithmetic number, because the mean of its divisors is an integer number (44835280).

Almost surely, 2^166531027 is an apocalyptic number.

166531027 is a deficient number, since it is larger than the sum of its proper divisors (12810093).

166531027 is a wasteful number, since it uses less digits than its factorization.

166531027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12810092.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 166531027 is about 12904.6901163879. The cubic root of 166531027 is about 550.1718768608.

Adding to 166531027 its reverse (720135661), we get a palindrome (886666688).

The spelling of 166531027 in words is "one hundred sixty-six million, five hundred thirty-one thousand, twenty-seven".