166040645 has 8 divisors (see below), whose sum is σ = 204634104. Its totient is φ = 129242304.

The previous prime is 166040629. The next prime is 166040647. The reversal of 166040645 is 546040661.

It can be written as a sum of positive squares in 4 ways, for example, as 99960004 + 66080641 = 9998^2 + 8129^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166040645 - 2⁴ = 166040629 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 (166040647) 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 7 ways as a sum of consecutive naturals, for example, 448574 + ... + 448943.

It is an arithmetic number, because the mean of its divisors is an integer number (25579263).

Almost surely, 2^166040645 is an apocalyptic number.

It is an amenable number.

166040645 is a deficient number, since it is larger than the sum of its proper divisors (38593459).

166040645 is an equidigital number, since it uses as much as digits as its factorization.

166040645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897559.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 166040645 is about 12885.6759620906. The cubic root of 166040645 is about 549.6313176541.

The spelling of 166040645 in words is "one hundred sixty-six million, forty thousand, six hundred forty-five".