166403 has 2 divisors, whose sum is σ = 166404. Its totient is φ = 166402.

The previous prime is 166399. The next prime is 166409. The reversal of 166403 is 304661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166403 - 2² = 166399 is a prime.

It is a plaindrome in base 14 and base 15.

It is not a weakly prime, because it can be changed into another prime (166409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83201 + 83202.

It is an arithmetic number, because the mean of its divisors is an integer number (83202).

2¹⁶⁶⁴⁰³ is an apocalyptic number.

166403 is a deficient number, since it is larger than the sum of its proper divisors (1).

166403 is an equidigital number, since it uses as much as digits as its factorization.

166403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 166403 is about 407.9252382484. The cubic root of 166403 is about 55.0030852264.

The spelling of 166403 in words is "one hundred sixty-six thousand, four hundred three".