166378 has 8 divisors (see below), whose sum is σ = 255780. Its totient is φ = 81120.

The previous prime is 166363. The next prime is 166393. The reversal of 166378 is 873661.

166378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (166363) and next prime (166393).

It can be written as a sum of positive squares in 2 ways, for example, as 165649 + 729 = 407^2 + 27^2 .

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

It is an Ulam number.

It is a plaindrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933 + ... + 1096.

2¹⁶⁶³⁷⁸ is an apocalyptic number.

166378 is a deficient number, since it is larger than the sum of its proper divisors (89402).

166378 is a wasteful number, since it uses less digits than its factorization.

166378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072.

The product of its digits is 6048, while the sum is 31.

The square root of 166378 is about 407.8945942275. The cubic root of 166378 is about 55.0003305765. Note that the first 3 decimals are identical.

The spelling of 166378 in words is "one hundred sixty-six thousand, three hundred seventy-eight".