2663664565 has 8 divisors (see below), whose sum is σ = 3214874808. Its totient is φ = 2118613440.

The previous prime is 2663664517. The next prime is 2663664571. The reversal of 2663664565 is 5654663662.

It can be written as a sum of positive squares in 4 ways, for example, as 351112644 + 2312551921 = 18738^2 + 48089^2 .

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

It is not a de Polignac number, because 2663664565 - 2¹¹ = 2663662517 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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1538826 + ... + 1540555.

It is an arithmetic number, because the mean of its divisors is an integer number (401859351).

Almost surely, 2^2663664565 is an apocalyptic number.

It is an amenable number.

2663664565 is a deficient number, since it is larger than the sum of its proper divisors (551210243).

2663664565 is a wasteful number, since it uses less digits than its factorization.

2663664565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3079559.

The product of its digits is 4665600, while the sum is 49.

The square root of 2663664565 is about 51610.7020394026. The cubic root of 2663664565 is about 1386.2019680385.

The spelling of 2663664565 in words is "two billion, six hundred sixty-three million, six hundred sixty-four thousand, five hundred sixty-five".