166540133 has 4 divisors (see below), whose sum is σ = 166800588. Its totient is φ = 166279680.

The previous prime is 166540103. The next prime is 166540141. The reversal of 166540133 is 331045661.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 126382564 + 40157569 = 11242^2 + 6337^2 .

It is a cyclic number.

It is not a de Polignac number, because 166540133 - 2¹² = 166536037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166540096 and 166540105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166540103) 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, 129266 + ... + 130547.

It is an arithmetic number, because the mean of its divisors is an integer number (41700147).

Almost surely, 2^166540133 is an apocalyptic number.

It is an amenable number.

166540133 is a deficient number, since it is larger than the sum of its proper divisors (260455).

166540133 is an equidigital number, since it uses as much as digits as its factorization.

166540133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260454.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 166540133 is about 12905.0429290258. The cubic root of 166540133 is about 550.1819045693.

Adding to 166540133 its reverse (331045661), we get a palindrome (497585794).

The spelling of 166540133 in words is "one hundred sixty-six million, five hundred forty thousand, one hundred thirty-three".