166605505 has 24 divisors (see below), whose sum is σ = 221789736. Its totient is φ = 120046080.

The previous prime is 166605473. The next prime is 166605529. The reversal of 166605505 is 505506661.

166605505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 11553201 + 155052304 = 3399^2 + 12452^2 .

It is not a de Polignac number, because 166605505 - 2⁵ = 166605473 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67147 + ... + 69583.

It is an arithmetic number, because the mean of its divisors is an integer number (9241239).

Almost surely, 2^166605505 is an apocalyptic number.

It is an amenable number.

166605505 is a deficient number, since it is larger than the sum of its proper divisors (55184231).

166605505 is a wasteful number, since it uses less digits than its factorization.

166605505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577 (or 2566 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 166605505 is about 12907.5754888360. The cubic root of 166605505 is about 550.2538827884.

The spelling of 166605505 in words is "one hundred sixty-six million, six hundred five thousand, five hundred five".