12555021503 has 4 divisors (see below), whose sum is σ = 12555245808. Its totient is φ = 12554797200.

The previous prime is 12555021481. The next prime is 12555021511. The reversal of 12555021503 is 30512055521.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12555021503 - 2⁶ = 12555021439 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 (12555021553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48875 + ... + 165827.

It is an arithmetic number, because the mean of its divisors is an integer number (3138811452).

Almost surely, 2^12555021503 is an apocalyptic number.

12555021503 is a deficient number, since it is larger than the sum of its proper divisors (224305).

12555021503 is a wasteful number, since it uses less digits than its factorization.

12555021503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224304.

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 12555021503 in words is "twelve billion, five hundred fifty-five million, twenty-one thousand, five hundred three".