166606169 has 4 divisors (see below), whose sum is σ = 168163344. Its totient is φ = 165048996.

The previous prime is 166606159. The next prime is 166606243. The reversal of 166606169 is 961606661.

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.

It is a cyclic number.

It is not a de Polignac number, because 166606169 - 2⁸ = 166605913 is a prime.

It is a super-2 number, since 2×166606169² = 55515231097713122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166606129) 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, 778427 + ... + 778640.

It is an arithmetic number, because the mean of its divisors is an integer number (42040836).

Almost surely, 2^166606169 is an apocalyptic number.

It is an amenable number.

166606169 is a deficient number, since it is larger than the sum of its proper divisors (1557175).

166606169 is a wasteful number, since it uses less digits than its factorization.

166606169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557174.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 166606169 is about 12907.6012101397. The cubic root of 166606169 is about 550.2546137928.

The spelling of 166606169 in words is "one hundred sixty-six million, six hundred six thousand, one hundred sixty-nine".