660169 has 4 divisors (see below), whose sum is σ = 688896. Its totient is φ = 631444.

The previous prime is 660167. The next prime is 660181. The reversal of 660169 is 961066.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 961066 = 2 ⋅480533.

It is a cyclic number.

It is not a de Polignac number, because 660169 - 2¹ = 660167 is a prime.

It is a super-2 number, since 2×660169² = 871646217122, which contains 22 as substring.

660169 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (660167) 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, 14329 + ... + 14374.

It is an arithmetic number, because the mean of its divisors is an integer number (172224).

2⁶⁶⁰¹⁶⁹ is an apocalyptic number.

It is an amenable number.

660169 is a deficient number, since it is larger than the sum of its proper divisors (28727).

660169 is a wasteful number, since it uses less digits than its factorization.

660169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28726.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 660169 is about 812.5078461160. The cubic root of 660169 is about 87.0733076579.

It can be divided in two parts, 6601 and 69, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 660169 in words is "six hundred sixty thousand, one hundred sixty-nine".