18845020019945 has 24 divisors (see below), whose sum is σ = 26338626678600. Its totient is φ = 12906326130432.

The previous prime is 18845020019939. The next prime is 18845020019977. The reversal of 18845020019945 is 54991002054881.

It can be written as a sum of positive squares in 4 ways, for example, as 2822588163136 + 16022431856809 = 1680056^2 + 4002803^2 .

It is not a de Polignac number, because 18845020019945 - 2⁴ = 18845020019929 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47341010 + ... + 47737419.

It is an arithmetic number, because the mean of its divisors is an integer number (1097442778275).

Almost surely, 2^{18845020019945} is an apocalyptic number.

It is an amenable number.

18845020019945 is a deficient number, since it is larger than the sum of its proper divisors (7493606658655).

18845020019945 is an equidigital number, since it uses as much as digits as its factorization.

18845020019945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95079257 (or 95079250 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 56.

The spelling of 18845020019945 in words is "eighteen trillion, eight hundred forty-five billion, twenty million, nineteen thousand, nine hundred forty-five".