12781518503 has 6 divisors (see below), whose sum is σ = 13840342704. Its totient is φ = 11798324616.

The previous prime is 12781518499. The next prime is 12781518553. The reversal of 12781518503 is 30581518721.

It is not a de Polignac number, because 12781518503 - 2² = 12781518499 is a prime.

It is a super-2 number, since 2×12781518503² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12781518553) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 37814975 + ... + 37815312.

It is an arithmetic number, because the mean of its divisors is an integer number (2306723784).

Almost surely, 2^12781518503 is an apocalyptic number.

12781518503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12781518503 is a deficient number, since it is larger than the sum of its proper divisors (1058824201).

12781518503 is an equidigital number, since it uses as much as digits as its factorization.

12781518503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75630313 (or 75630300 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 41.

The spelling of 12781518503 in words is "twelve billion, seven hundred eighty-one million, five hundred eighteen thousand, five hundred three".