166611005 has 16 divisors (see below), whose sum is σ = 222753024. Its totient is φ = 118591680.

The previous prime is 166611001. The next prime is 166611007. The reversal of 166611005 is 500116661.

It is not a de Polignac number, because 166611005 - 2² = 166611001 is a prime.

It is a super-2 number, since 2×166611005² = 55518453974220050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166611001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29642 + ... + 34811.

It is an arithmetic number, because the mean of its divisors is an integer number (13922064).

Almost surely, 2^166611005 is an apocalyptic number.

It is an amenable number.

166611005 is a deficient number, since it is larger than the sum of its proper divisors (56142019).

166611005 is a wasteful number, since it uses less digits than its factorization.

166611005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64516.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 166611005 is about 12907.7885402574. The cubic root of 166611005 is about 550.2599377365.

Adding to 166611005 its reverse (500116661), we get a palindrome (666727666).

The spelling of 166611005 in words is "one hundred sixty-six million, six hundred eleven thousand, five".