166478275 has 12 divisors (see below), whose sum is σ = 206709984. Its totient is φ = 133004000.

The previous prime is 166478269. The next prime is 166478293. The reversal of 166478275 is 572874661.

It is a happy number.

It is not a de Polignac number, because 166478275 - 2⁵ = 166478243 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 16470 + ... + 24580.

It is an arithmetic number, because the mean of its divisors is an integer number (17225832).

Almost surely, 2^166478275 is an apocalyptic number.

166478275 is a deficient number, since it is larger than the sum of its proper divisors (40231709).

166478275 is an equidigital number, since it uses as much as digits as its factorization.

166478275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8942 (or 8937 counting only the distinct ones).

The product of its digits is 564480, while the sum is 46.

The square root of 166478275 is about 12902.6460464511. The cubic root of 166478275 is about 550.1137781141.

It can be divided in two parts, 166478 and 275, that added together give a triangular number (166753 = T₅₇₇).

The spelling of 166478275 in words is "one hundred sixty-six million, four hundred seventy-eight thousand, two hundred seventy-five".