166406941 has 2 divisors, whose sum is σ = 166406942. Its totient is φ = 166406940.

The previous prime is 166406939. The next prime is 166406951. The reversal of 166406941 is 149604661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97101316 + 69305625 = 9854^2 + 8325^2 .

It is a cyclic number.

It is not a de Polignac number, because 166406941 - 2¹ = 166406939 is a prime.

Together with 166406939, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 166406941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166406951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83203470 + 83203471.

It is an arithmetic number, because the mean of its divisors is an integer number (83203471).

Almost surely, 2^166406941 is an apocalyptic number.

It is an amenable number.

166406941 is a deficient number, since it is larger than the sum of its proper divisors (1).

166406941 is an equidigital number, since it uses as much as digits as its factorization.

166406941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 166406941 is about 12899.8814335636. The cubic root of 166406941 is about 550.0351944421.

The spelling of 166406941 in words is "one hundred sixty-six million, four hundred six thousand, nine hundred forty-one".