166264321 has 4 divisors (see below), whose sum is σ = 168606144. Its totient is φ = 163922500.

The previous prime is 166264313. The next prime is 166264361. The reversal of 166264321 is 123462661.

166264321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 166264321 - 2³ = 166264313 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166264361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170805 + ... + 1170946.

It is an arithmetic number, because the mean of its divisors is an integer number (42151536).

Almost surely, 2^166264321 is an apocalyptic number.

It is an amenable number.

166264321 is a deficient number, since it is larger than the sum of its proper divisors (2341823).

166264321 is an equidigital number, since it uses as much as digits as its factorization.

166264321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341822.

The product of its digits is 10368, while the sum is 31.

The square root of 166264321 is about 12894.3522908287. The cubic root of 166264321 is about 549.8780126152.

The spelling of 166264321 in words is "one hundred sixty-six million, two hundred sixty-four thousand, three hundred twenty-one".