166378490 has 16 divisors (see below), whose sum is σ = 317098152. Its totient is φ = 62636544.

The previous prime is 166378483. The next prime is 166378493. The reversal of 166378490 is 94873661.

166378490 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 165920161 + 458329 = 12881^2 + 677^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166378493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489179 + ... + 489518.

Almost surely, 2^166378490 is an apocalyptic number.

166378490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166378490 is a deficient number, since it is larger than the sum of its proper divisors (150719662).

166378490 is a wasteful number, since it uses less digits than its factorization.

166378490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978721.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 166378490 is about 12898.7786243504. The cubic root of 166378490 is about 550.0038457031.

The spelling of 166378490 in words is "one hundred sixty-six million, three hundred seventy-eight thousand, four hundred ninety".