166570421 has 8 divisors (see below), whose sum is σ = 168748800. Its totient is φ = 164404080.

The previous prime is 166570381. The next prime is 166570429. The reversal of 166570421 is 124075661.

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 166570421 - 2⁶ = 166570357 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 (166570429) 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 7 ways as a sum of consecutive naturals, for example, 26720 + ... + 32358.

It is an arithmetic number, because the mean of its divisors is an integer number (21093600).

Almost surely, 2^166570421 is an apocalyptic number.

It is an amenable number.

166570421 is a deficient number, since it is larger than the sum of its proper divisors (2178379).

166570421 is a wasteful number, since it uses less digits than its factorization.

166570421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6019.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 166570421 is about 12906.2163704162. The cubic root of 166570421 is about 550.2152556884.

The spelling of 166570421 in words is "one hundred sixty-six million, five hundred seventy thousand, four hundred twenty-one".