166234421 has 4 divisors (see below), whose sum is σ = 166610112. Its totient is φ = 165858732.

The previous prime is 166234417. The next prime is 166234427. The reversal of 166234421 is 124432661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166234421 - 2² = 166234417 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 (166234427) 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 3 ways as a sum of consecutive naturals, for example, 187181 + ... + 188066.

It is an arithmetic number, because the mean of its divisors is an integer number (41652528).

Almost surely, 2^166234421 is an apocalyptic number.

It is an amenable number.

166234421 is a deficient number, since it is larger than the sum of its proper divisors (375691).

166234421 is an equidigital number, since it uses as much as digits as its factorization.

166234421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375690.

The product of its digits is 6912, while the sum is 29.

The square root of 166234421 is about 12893.1928163663. The cubic root of 166234421 is about 549.8450483606.

The spelling of 166234421 in words is "one hundred sixty-six million, two hundred thirty-four thousand, four hundred twenty-one".