2165777065 has 8 divisors (see below), whose sum is σ = 2600833608. Its totient is φ = 1731354240.

The previous prime is 2165777063. The next prime is 2165777137. The reversal of 2165777065 is 5607775612.

It can be written as a sum of positive squares in 4 ways, for example, as 536524569 + 1629252496 = 23163^2 + 40364^2 .

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

It is not a de Polignac number, because 2165777065 - 2¹ = 2165777063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2165777063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150876 + ... + 164605.

It is an arithmetic number, because the mean of its divisors is an integer number (325104201).

Almost surely, 2^2165777065 is an apocalyptic number.

It is an amenable number.

2165777065 is a deficient number, since it is larger than the sum of its proper divisors (435056543).

2165777065 is a wasteful number, since it uses less digits than its factorization.

2165777065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316859.

The product of its (nonzero) digits is 617400, while the sum is 46.

The square root of 2165777065 is about 46537.9099767061. The cubic root of 2165777065 is about 1293.8122241615.

The spelling of 2165777065 in words is "two billion, one hundred sixty-five million, seven hundred seventy-seven thousand, sixty-five".