166725331 has 4 divisors (see below), whose sum is σ = 166754392. Its totient is φ = 166696272.

The previous prime is 166725289. The next prime is 166725353. The reversal of 166725331 is 133527661.

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 166725331 - 2¹⁵ = 166692563 is a prime.

It is a super-2 number, since 2×166725331² = 55594671994119122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166723331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2730 + ... + 18463.

It is an arithmetic number, because the mean of its divisors is an integer number (41688598).

Almost surely, 2^166725331 is an apocalyptic number.

166725331 is a deficient number, since it is larger than the sum of its proper divisors (29061).

166725331 is an equidigital number, since it uses as much as digits as its factorization.

166725331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29060.

The product of its digits is 22680, while the sum is 34.

The square root of 166725331 is about 12912.2163473201. The cubic root of 166725331 is about 550.3857690284.

The spelling of 166725331 in words is "one hundred sixty-six million, seven hundred twenty-five thousand, three hundred thirty-one".