166240565 has 8 divisors (see below), whose sum is σ = 199988568. Its totient is φ = 132659200.

The previous prime is 166240561. The next prime is 166240567. The reversal of 166240565 is 565042661.

It can be written as a sum of positive squares in 4 ways, for example, as 40666129 + 125574436 = 6377^2 + 11206^2 .

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

It is not a de Polignac number, because 166240565 - 2² = 166240561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166240561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39452 + ... + 43461.

It is an arithmetic number, because the mean of its divisors is an integer number (24998571).

Almost surely, 2^166240565 is an apocalyptic number.

It is an amenable number.

166240565 is a deficient number, since it is larger than the sum of its proper divisors (33748003).

166240565 is an equidigital number, since it uses as much as digits as its factorization.

166240565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83319.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 166240565 is about 12893.4310794296. The cubic root of 166240565 is about 549.8518223414.

The spelling of 166240565 in words is "one hundred sixty-six million, two hundred forty thousand, five hundred sixty-five".