162661 has 8 divisors (see below), whose sum is σ = 172800. Its totient is φ = 152880.

The previous prime is 162649. The next prime is 162671. The reversal of 162661 is 166261.

162661 = T₄₄ + T₄₅ + ... + T₁₀₁.

162661 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

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

It is a cyclic number.

It is not a de Polignac number, because 162661 - 2⁵ = 162629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (162601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2020 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (21600).

2¹⁶²⁶⁶¹ is an apocalyptic number.

It is an amenable number.

162661 is a deficient number, since it is larger than the sum of its proper divisors (10139).

162661 is an equidigital number, since it uses as much as digits as its factorization.

162661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179.

The product of its digits is 432, while the sum is 22.

The square root of 162661 is about 403.3125338990. The cubic root of 162661 is about 54.5876601792.

Subtracting 162661 from its reverse (166261), we obtain a square (3600 = 60²).

The spelling of 162661 in words is "one hundred sixty-two thousand, six hundred sixty-one".