166055641 has 2 divisors, whose sum is σ = 166055642. Its totient is φ = 166055640.

The previous prime is 166055633. The next prime is 166055671. The reversal of 166055641 is 146550661.

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., 141015625 + 25040016 = 11875^2 + 5004^2 .

It is a cyclic number.

It is not a de Polignac number, because 166055641 - 2³ = 166055633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166055597 and 166055606.

It is not a weakly prime, because it can be changed into another prime (166055671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83027820 + 83027821.

It is an arithmetic number, because the mean of its divisors is an integer number (83027821).

Almost surely, 2^166055641 is an apocalyptic number.

It is an amenable number.

166055641 is a deficient number, since it is larger than the sum of its proper divisors (1).

166055641 is an equidigital number, since it uses as much as digits as its factorization.

166055641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 166055641 is about 12886.2578353842. The cubic root of 166055641 is about 549.6478638500.

The spelling of 166055641 in words is "one hundred sixty-six million, fifty-five thousand, six hundred forty-one".