166051 has 4 divisors (see below), whose sum is σ = 169632. Its totient is φ = 162472.

The previous prime is 166043. The next prime is 166063. The reversal of 166051 is 150661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150661 = 7 ⋅21523.

It is a cyclic number.

It is not a de Polignac number, because 166051 - 2³ = 166043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166021) 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 3 ways as a sum of consecutive naturals, for example, 1720 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (42408).

2¹⁶⁶⁰⁵¹ is an apocalyptic number.

166051 is a deficient number, since it is larger than the sum of its proper divisors (3581).

166051 is an equidigital number, since it uses as much as digits as its factorization.

166051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 166051 is about 407.4935582313. The cubic root of 166051 is about 54.9642743198.

It can be divided in two parts, 1660 and 51, that added together give a triangular number (1711 = T₅₈).

The spelling of 166051 in words is "one hundred sixty-six thousand, fifty-one".