166655393 has 4 divisors (see below), whose sum is σ = 166760580. Its totient is φ = 166550208.

The previous prime is 166655387. The next prime is 166655407. The reversal of 166655393 is 393556661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155176849 + 11478544 = 12457^2 + 3388^2 .

It is a cyclic number.

It is not a de Polignac number, because 166655393 - 2¹² = 166651297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166655323) 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 in 3 ways as a sum of consecutive naturals, for example, 50180 + ... + 53397.

It is an arithmetic number, because the mean of its divisors is an integer number (41690145).

Almost surely, 2^166655393 is an apocalyptic number.

It is an amenable number.

166655393 is a deficient number, since it is larger than the sum of its proper divisors (105187).

166655393 is a wasteful number, since it uses less digits than its factorization.

166655393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105186.

The product of its digits is 437400, while the sum is 44.

The square root of 166655393 is about 12909.5078527417. The cubic root of 166655393 is about 550.3087995936.

The spelling of 166655393 in words is "one hundred sixty-six million, six hundred fifty-five thousand, three hundred ninety-three".