18645318260738 has 16 divisors (see below), whose sum is σ = 30853978812216. Its totient is φ = 8395640492160.

The previous prime is 18645318260731. The next prime is 18645318260753. The reversal of 18645318260738 is 83706281354681.

It can be written as a sum of positive squares in 4 ways, for example, as 5242346006689 + 13402972254049 = 2289617^2 + 3661007^2 .

It is not an unprimeable number, because it can be changed into a prime (18645318260731) 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, 8745457781 + ... + 8745459912.

Almost surely, 2^{18645318260738} is an apocalyptic number.

18645318260738 is a deficient number, since it is larger than the sum of its proper divisors (12208660551478).

18645318260738 is a wasteful number, since it uses less digits than its factorization.

18645318260738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17490917749.

The product of its (nonzero) digits is 46448640, while the sum is 62.

The spelling of 18645318260738 in words is "eighteen trillion, six hundred forty-five billion, three hundred eighteen million, two hundred sixty thousand, seven hundred thirty-eight".