166531741 has 4 divisors (see below), whose sum is σ = 166614300. Its totient is φ = 166449184.

The previous prime is 166531699. The next prime is 166531747. The reversal of 166531741 is 147135661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 147135661 = 73 ⋅2015557.

It can be written as a sum of positive squares in 2 ways, for example, as 105144516 + 61387225 = 10254^2 + 7835^2 .

It is a cyclic number.

It is not a de Polignac number, because 166531741 - 2⁷ = 166531613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166531697 and 166531706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166531747) 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, 38176 + ... + 42313.

It is an arithmetic number, because the mean of its divisors is an integer number (41653575).

Almost surely, 2^166531741 is an apocalyptic number.

It is an amenable number.

166531741 is a deficient number, since it is larger than the sum of its proper divisors (82559).

166531741 is an equidigital number, since it uses as much as digits as its factorization.

166531741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82558.

The product of its digits is 15120, while the sum is 34.

The square root of 166531741 is about 12904.7177807188. The cubic root of 166531741 is about 550.1726631450.

The spelling of 166531741 in words is "one hundred sixty-six million, five hundred thirty-one thousand, seven hundred forty-one".