18503355353540 has 12 divisors (see below), whose sum is σ = 38857046242476. Its totient is φ = 7401342141408.

The previous prime is 18503355353537. The next prime is 18503355353551. The reversal of 18503355353540 is 4535355330581.

It can be written as a sum of positive squares in 2 ways, for example, as 8303814509956 + 10199540843584 = 2881634^2 + 3193672^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462583883819 + ... + 462583883858.

It is an arithmetic number, because the mean of its divisors is an integer number (3238087186873).

Almost surely, 2^{18503355353540} is an apocalyptic number.

18503355353540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18503355353540 is an abundant number, since it is smaller than the sum of its proper divisors (20353690888936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18503355353540 is a wasteful number, since it uses less digits than its factorization.

18503355353540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925167767686 (or 925167767684 counting only the distinct ones).

The product of its (nonzero) digits is 8100000, while the sum is 50.

The spelling of 18503355353540 in words is "eighteen trillion, five hundred three billion, three hundred fifty-five million, three hundred fifty-three thousand, five hundred forty".