166444147 has 4 divisors (see below), whose sum is σ = 168928456. Its totient is φ = 163959840.

The previous prime is 166444121. The next prime is 166444183. The reversal of 166444147 is 741444661.

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

It is a cyclic number.

It is not a de Polignac number, because 166444147 - 2²⁷ = 32226419 is a prime.

It is a super-4 number, since 4×166444147⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166444847) 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, 1242054 + ... + 1242187.

It is an arithmetic number, because the mean of its divisors is an integer number (42232114).

Almost surely, 2^166444147 is an apocalyptic number.

166444147 is a deficient number, since it is larger than the sum of its proper divisors (2484309).

166444147 is an equidigital number, since it uses as much as digits as its factorization.

166444147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484308.

The product of its digits is 64512, while the sum is 37.

The square root of 166444147 is about 12901.3234592425. The cubic root of 166444147 is about 550.0761844880.

The spelling of 166444147 in words is "one hundred sixty-six million, four hundred forty-four thousand, one hundred forty-seven".