166801 has 4 divisors (see below), whose sum is σ = 175600. Its totient is φ = 158004.

The previous prime is 166799. The next prime is 166807. The reversal of 166801 is 108661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 166801 - 2¹ = 166799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166807) 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, 4371 + ... + 4408.

It is an arithmetic number, because the mean of its divisors is an integer number (43900).

2¹⁶⁶⁸⁰¹ is an apocalyptic number.

It is an amenable number.

166801 is a deficient number, since it is larger than the sum of its proper divisors (8799).

166801 is an equidigital number, since it uses as much as digits as its factorization.

166801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8798.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 166801 is about 408.4127813867. The cubic root of 166801 is about 55.0469021408.

The spelling of 166801 in words is "one hundred sixty-six thousand, eight hundred one".