166090 has 16 divisors (see below), whose sum is σ = 316872. Its totient is φ = 62464.

The previous prime is 166081. The next prime is 166099. The reversal of 166090 is 90661.

166090 = T₁₅ + T₁₆ + ... + T₉₉.

It is an interprime number because it is at equal distance from previous prime (166081) and next prime (166099).

It can be written as a sum of positive squares in 4 ways, for example, as 165649 + 441 = 407^2 + 21^2 .

It is not an unprimeable number, because it can be changed into a prime (166099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319 + ... + 658.

2¹⁶⁶⁰⁹⁰ is an apocalyptic number.

166090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166090 is a deficient number, since it is larger than the sum of its proper divisors (150782).

166090 is a wasteful number, since it uses less digits than its factorization.

166090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 166090 is about 407.5414089390. The cubic root of 166090 is about 54.9685770920.

The spelling of 166090 in words is "one hundred sixty-six thousand, ninety".