166565705 has 8 divisors (see below), whose sum is σ = 206771400. Its totient is φ = 128657536.

The previous prime is 166565699. The next prime is 166565713. The reversal of 166565705 is 507565661.

It can be written as a sum of positive squares in 4 ways, for example, as 43178041 + 123387664 = 6571^2 + 11108^2 .

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 166565705 - 2¹⁰ = 166564681 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 574220 + ... + 574509.

It is an arithmetic number, because the mean of its divisors is an integer number (25846425).

Almost surely, 2^166565705 is an apocalyptic number.

It is an amenable number.

166565705 is a deficient number, since it is larger than the sum of its proper divisors (40205695).

166565705 is a wasteful number, since it uses less digits than its factorization.

166565705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148763.

The product of its (nonzero) digits is 189000, while the sum is 41.

The square root of 166565705 is about 12906.0336664678. The cubic root of 166565705 is about 550.2100630105.

The spelling of 166565705 in words is "one hundred sixty-six million, five hundred sixty-five thousand, seven hundred five".