166590505 has 8 divisors (see below), whose sum is σ = 200001600. Its totient is φ = 133210416.

The previous prime is 166590481. The next prime is 166590509. The reversal of 166590505 is 505095661.

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

It is a cyclic number.

It is not a de Polignac number, because 166590505 - 2¹⁵ = 166557737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166590509) 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, 6436 + ... + 19354.

It is an arithmetic number, because the mean of its divisors is an integer number (25000200).

Almost surely, 2^166590505 is an apocalyptic number.

It is an amenable number.

166590505 is a deficient number, since it is larger than the sum of its proper divisors (33411095).

166590505 is a wasteful number, since it uses less digits than its factorization.

166590505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15503.

The product of its (nonzero) digits is 40500, while the sum is 37.

The square root of 166590505 is about 12906.9944216305. The cubic root of 166590505 is about 550.2373686163.

The spelling of 166590505 in words is "one hundred sixty-six million, five hundred ninety thousand, five hundred five".