166505169 has 8 divisors (see below), whose sum is σ = 222075232. Its totient is φ = 110969280.

The previous prime is 166505137. The next prime is 166505197. The reversal of 166505169 is 961505661.

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

It is not a de Polignac number, because 166505169 - 2⁵ = 166505137 is a prime.

It is a super-2 number, since 2×166505169² = 55447942607437122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166505369) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6729 + ... + 19449.

It is an arithmetic number, because the mean of its divisors is an integer number (27759404).

Almost surely, 2^166505169 is an apocalyptic number.

It is an amenable number.

166505169 is a deficient number, since it is larger than the sum of its proper divisors (55570063).

166505169 is a wasteful number, since it uses less digits than its factorization.

166505169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17087.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 166505169 is about 12903.6881936910. The cubic root of 166505169 is about 550.1433995233.

The spelling of 166505169 in words is "one hundred sixty-six million, five hundred five thousand, one hundred sixty-nine".