166700378 has 16 divisors (see below), whose sum is σ = 270849096. Its totient is φ = 76491840.

The previous prime is 166700377. The next prime is 166700393. The reversal of 166700378 is 873007661.

It can be written as a sum of positive squares in 4 ways, for example, as 164429329 + 2271049 = 12823^2 + 1507^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166700371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14033 + ... + 23028.

Almost surely, 2^166700378 is an apocalyptic number.

166700378 is a deficient number, since it is larger than the sum of its proper divisors (104148718).

166700378 is a wasteful number, since it uses less digits than its factorization.

166700378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37249.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 166700378 is about 12911.2500556685. The cubic root of 166700378 is about 550.3583097711.

The spelling of 166700378 in words is "one hundred sixty-six million, seven hundred thousand, three hundred seventy-eight".