18529741865 has 4 divisors (see below), whose sum is σ = 22235690244. Its totient is φ = 14823793488.

The previous prime is 18529741861. The next prime is 18529741897. The reversal of 18529741865 is 56814792581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56814792581 = 673 ⋅84420197.

It can be written as a sum of positive squares in 2 ways, for example, as 7895388736 + 10634353129 = 88856^2 + 103123^2 .

It is a cyclic number.

It is not a de Polignac number, because 18529741865 - 2² = 18529741861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18529741865.

It is not an unprimeable number, because it can be changed into a prime (18529741861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1852974182 + ... + 1852974191.

It is an arithmetic number, because the mean of its divisors is an integer number (5558922561).

Almost surely, 2^18529741865 is an apocalyptic number.

It is an amenable number.

18529741865 is a deficient number, since it is larger than the sum of its proper divisors (3705948379).

18529741865 is an equidigital number, since it uses as much as digits as its factorization.

18529741865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3705948378.

The product of its digits is 4838400, while the sum is 56.

The spelling of 18529741865 in words is "eighteen billion, five hundred twenty-nine million, seven hundred forty-one thousand, eight hundred sixty-five".