166935921 has 8 divisors (see below), whose sum is σ = 222890304. Its totient is φ = 111136080.

The previous prime is 166935913. The next prime is 166935941. The reversal of 166935921 is 129539661.

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

It is not a de Polignac number, because 166935921 - 2³ = 166935913 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (166935941) 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, 36090 + ... + 40451.

It is an arithmetic number, because the mean of its divisors is an integer number (27861288).

Almost surely, 2^166935921 is an apocalyptic number.

It is an amenable number.

166935921 is a deficient number, since it is larger than the sum of its proper divisors (55954383).

166935921 is an equidigital number, since it uses as much as digits as its factorization.

166935921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77271.

The product of its digits is 87480, while the sum is 42.

The square root of 166935921 is about 12920.3684544985. The cubic root of 166935921 is about 550.6174014437.

The spelling of 166935921 in words is "one hundred sixty-six million, nine hundred thirty-five thousand, nine hundred twenty-one".