166990 has 8 divisors (see below), whose sum is σ = 300600. Its totient is φ = 66792.

The previous prime is 166987. The next prime is 167009. The reversal of 166990 is 99661.

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

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, 8340 + ... + 8359.

It is an arithmetic number, because the mean of its divisors is an integer number (37575).

2¹⁶⁶⁹⁹⁰ is an apocalyptic number.

166990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166990 is a deficient number, since it is larger than the sum of its proper divisors (133610).

166990 is a wasteful number, since it uses less digits than its factorization.

166990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16706.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 166990 is about 408.6440994313. The cubic root of 166990 is about 55.0676852646.

It can be divided in two parts, 166 and 990, that added together give a square (1156 = 34²).

The spelling of 166990 in words is "one hundred sixty-six thousand, nine hundred ninety".