166486541 has 4 divisors (see below), whose sum is σ = 179293212. Its totient is φ = 153679872.

The previous prime is 166486519. The next prime is 166486553. The reversal of 166486541 is 145684661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145684661 = 29 ⋅5023609.

It can be written as a sum of positive squares in 2 ways, for example, as 45024100 + 121462441 = 6710^2 + 11021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166486541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166486511) 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, 6403316 + ... + 6403341.

It is an arithmetic number, because the mean of its divisors is an integer number (44823303).

Almost surely, 2^166486541 is an apocalyptic number.

It is an amenable number.

166486541 is a deficient number, since it is larger than the sum of its proper divisors (12806671).

166486541 is a wasteful number, since it uses less digits than its factorization.

166486541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12806670.

The product of its digits is 138240, while the sum is 41.

The square root of 166486541 is about 12902.9663643675. The cubic root of 166486541 is about 550.1228827359.

The spelling of 166486541 in words is "one hundred sixty-six million, four hundred eighty-six thousand, five hundred forty-one".