166605566 has 8 divisors (see below), whose sum is σ = 263061480. Its totient is φ = 78918408.

The previous prime is 166605533. The next prime is 166605581. The reversal of 166605566 is 665506661.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2192141 + ... + 2192216.

It is an arithmetic number, because the mean of its divisors is an integer number (32882685).

Almost surely, 2^166605566 is an apocalyptic number.

166605566 is a deficient number, since it is larger than the sum of its proper divisors (96455914).

166605566 is a wasteful number, since it uses less digits than its factorization.

166605566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4384378.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 166605566 is about 12907.5778517892. The cubic root of 166605566 is about 550.2539499440.

The spelling of 166605566 in words is "one hundred sixty-six million, six hundred five thousand, five hundred sixty-six".