1818768565 has 8 divisors (see below), whose sum is σ = 2183212728. Its totient is φ = 1454554560.

The previous prime is 1818768563. The next prime is 1818768577. The reversal of 1818768565 is 5658678181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 792591409 + 1026177156 = 28153^2 + 32034^2 .

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

It is not a de Polignac number, because 1818768565 - 2¹ = 1818768563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818768563) 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, 39646 + ... + 72175.

It is an arithmetic number, because the mean of its divisors is an integer number (272901591).

Almost surely, 2^1818768565 is an apocalyptic number.

It is an amenable number.

1818768565 is a deficient number, since it is larger than the sum of its proper divisors (364444163).

1818768565 is a wasteful number, since it uses less digits than its factorization.

1818768565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115079.

The product of its digits is 3225600, while the sum is 55.

The square root of 1818768565 is about 42647.0229324393. The cubic root of 1818768565 is about 1220.6537222542.

The spelling of 1818768565 in words is "one billion, eight hundred eighteen million, seven hundred sixty-eight thousand, five hundred sixty-five".