166893641 has 8 divisors (see below), whose sum is σ = 178534440. Its totient is φ = 155455488.

The previous prime is 166893599. The next prime is 166893647. The reversal of 166893641 is 146398661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20967241 + 145926400 = 4579^2 + 12080^2 .

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 166893641 - 2⁶ = 166893577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166893592 and 166893601.

It is not an unprimeable number, because it can be changed into a prime (166893647) 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, 48956 + ... + 52253.

It is an arithmetic number, because the mean of its divisors is an integer number (22316805).

Almost surely, 2^166893641 is an apocalyptic number.

It is an amenable number.

166893641 is a deficient number, since it is larger than the sum of its proper divisors (11640799).

166893641 is a wasteful number, since it uses less digits than its factorization.

166893641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101323.

The product of its digits is 186624, while the sum is 44.

The square root of 166893641 is about 12918.7321746370. The cubic root of 166893641 is about 550.5709124091.

The spelling of 166893641 in words is "one hundred sixty-six million, eight hundred ninety-three thousand, six hundred forty-one".