18048783565 has 4 divisors (see below), whose sum is σ = 21658540284. Its totient is φ = 14439026848.

The previous prime is 18048783539. The next prime is 18048783589. The reversal of 18048783565 is 56538784081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56538784081 = 13 ⋅4349137237.

It can be written as a sum of positive squares in 2 ways, for example, as 9326344329 + 8722439236 = 96573^2 + 93394^2 .

It is a cyclic number.

It is not a de Polignac number, because 18048783565 - 2⁷ = 18048783437 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 3 ways as a sum of consecutive naturals, for example, 1804878352 + ... + 1804878361.

It is an arithmetic number, because the mean of its divisors is an integer number (5414635071).

Almost surely, 2^18048783565 is an apocalyptic number.

It is an amenable number.

18048783565 is a deficient number, since it is larger than the sum of its proper divisors (3609756719).

18048783565 is an equidigital number, since it uses as much as digits as its factorization.

18048783565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3609756718.

The product of its (nonzero) digits is 6451200, while the sum is 55.

The spelling of 18048783565 in words is "eighteen billion, forty-eight million, seven hundred eighty-three thousand, five hundred sixty-five".