2145065605 has 8 divisors (see below), whose sum is σ = 2575072152. Its totient is φ = 1715390208.

The previous prime is 2145065597. The next prime is 2145065617. The reversal of 2145065605 is 5065605412.

It can be written as a sum of positive squares in 4 ways, for example, as 2579236 + 2142486369 = 1606^2 + 46287^2 .

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 2145065605 - 2³ = 2145065597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68304 + ... + 94633.

It is an arithmetic number, because the mean of its divisors is an integer number (321884019).

Almost surely, 2^2145065605 is an apocalyptic number.

It is an amenable number.

2145065605 is a deficient number, since it is larger than the sum of its proper divisors (430006547).

2145065605 is a wasteful number, since it uses less digits than its factorization.

2145065605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165575.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 2145065605 is about 46314.8529631694. The cubic root of 2145065605 is about 1289.6747382182.

The spelling of 2145065605 in words is "two billion, one hundred forty-five million, sixty-five thousand, six hundred five".