166066531 has 4 divisors (see below), whose sum is σ = 166481064. Its totient is φ = 165652000.

The previous prime is 166066529. The next prime is 166066553. The reversal of 166066531 is 135660661.

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 166066531 - 2¹ = 166066529 is a prime.

It is a super-2 number, since 2×166066531² = 55156185436747922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166066501) 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, 206665 + ... + 207466.

It is an arithmetic number, because the mean of its divisors is an integer number (41620266).

Almost surely, 2^166066531 is an apocalyptic number.

166066531 is a deficient number, since it is larger than the sum of its proper divisors (414533).

166066531 is an equidigital number, since it uses as much as digits as its factorization.

166066531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414532.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 166066531 is about 12886.6803716085. The cubic root of 166066531 is about 549.6598789681.

The spelling of 166066531 in words is "one hundred sixty-six million, sixty-six thousand, five hundred thirty-one".