18145453023503 has 16 divisors (see below), whose sum is σ = 19584314776320. Its totient is φ = 16712750456064.

The previous prime is 18145453023457. The next prime is 18145453023553. The reversal of 18145453023503 is 30532035454181.

It is a Cunningham number, because it is equal to 4259748²-1.

It is not a de Polignac number, because 18145453023503 - 2²⁰ = 18145451974927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18145453023553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55212875 + ... + 55540547.

It is an arithmetic number, because the mean of its divisors is an integer number (1224019673520).

Almost surely, 2^{18145453023503} is an apocalyptic number.

18145453023503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18145453023503 is a deficient number, since it is larger than the sum of its proper divisors (1438861752817).

18145453023503 is a wasteful number, since it uses less digits than its factorization.

18145453023503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337058.

The product of its (nonzero) digits is 864000, while the sum is 44.

Adding to 18145453023503 its reverse (30532035454181), we get a palindrome (48677488477684).

The spelling of 18145453023503 in words is "eighteen trillion, one hundred forty-five billion, four hundred fifty-three million, twenty-three thousand, five hundred three".