166659565 has 16 divisors (see below), whose sum is σ = 207060480. Its totient is φ = 128640960.

The previous prime is 166659539. The next prime is 166659611. The reversal of 166659565 is 565956661.

It is a happy number.

It is not a de Polignac number, because 166659565 - 2¹⁷ = 166528493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57327 + ... + 60163.

It is an arithmetic number, because the mean of its divisors is an integer number (12941280).

Almost surely, 2^166659565 is an apocalyptic number.

It is an amenable number.

166659565 is a deficient number, since it is larger than the sum of its proper divisors (40400915).

166659565 is a wasteful number, since it uses less digits than its factorization.

166659565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3252.

The product of its digits is 1458000, while the sum is 49.

The square root of 166659565 is about 12909.6694380608. The cubic root of 166659565 is about 550.3133916425.

The spelling of 166659565 in words is "one hundred sixty-six million, six hundred fifty-nine thousand, five hundred sixty-five".