166444985 has 8 divisors (see below), whose sum is σ = 228267456. Its totient is φ = 114133680.

The previous prime is 166444979. The next prime is 166445003. The reversal of 166444985 is 589444661.

It is a happy number.

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

It is not a de Polignac number, because 166444985 - 2⁴ = 166444969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2377751 + ... + 2377820.

It is an arithmetic number, because the mean of its divisors is an integer number (28533432).

Almost surely, 2^166444985 is an apocalyptic number.

It is an amenable number.

166444985 is a deficient number, since it is larger than the sum of its proper divisors (61822471).

166444985 is an equidigital number, since it uses as much as digits as its factorization.

166444985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4755583.

The product of its digits is 829440, while the sum is 47.

The square root of 166444985 is about 12901.3559364898. The cubic root of 166444985 is about 550.0771076466.

The spelling of 166444985 in words is "one hundred sixty-six million, four hundred forty-four thousand, nine hundred eighty-five".