166903 has 4 divisors (see below), whose sum is σ = 182088. Its totient is φ = 151720.

The previous prime is 166871. The next prime is 166909. The reversal of 166903 is 309661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309661 = 11 ⋅28151.

It is a cyclic number.

It is not a de Polignac number, because 166903 - 2⁵ = 166871 is a prime.

It is a super-2 number, since 2×166903² = 55713222818, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7576 + ... + 7597.

It is an arithmetic number, because the mean of its divisors is an integer number (45522).

2¹⁶⁶⁹⁰³ is an apocalyptic number.

166903 is a deficient number, since it is larger than the sum of its proper divisors (15185).

166903 is a wasteful number, since it uses less digits than its factorization.

166903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15184.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 166903 is about 408.5376359652. The cubic root of 166903 is about 55.0581203788.

The spelling of 166903 in words is "one hundred sixty-six thousand, nine hundred three".