166849549 has 2 divisors, whose sum is σ = 166849550. Its totient is φ = 166849548.

The previous prime is 166849547. The next prime is 166849619. The reversal of 166849549 is 945948661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138227049 + 28622500 = 11757^2 + 5350^2 .

It is a cyclic number.

It is not a de Polignac number, because 166849549 - 2¹ = 166849547 is a prime.

Together with 166849547, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 166849496 and 166849505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166849547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83424774 + 83424775.

It is an arithmetic number, because the mean of its divisors is an integer number (83424775).

Almost surely, 2^166849549 is an apocalyptic number.

It is an amenable number.

166849549 is a deficient number, since it is larger than the sum of its proper divisors (1).

166849549 is an equidigital number, since it uses as much as digits as its factorization.

166849549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 52.

The square root of 166849549 is about 12917.0255477025. The cubic root of 166849549 is about 550.5224226232.

The spelling of 166849549 in words is "one hundred sixty-six million, eight hundred forty-nine thousand, five hundred forty-nine".