12561587503 has 8 divisors (see below), whose sum is σ = 12908574000. Its totient is φ = 12216534720.

The previous prime is 12561587473. The next prime is 12561587509. The reversal of 12561587503 is 30578516521.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12561587503 - 2¹³ = 12561579311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12561587503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561587509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470253 + ... + 496246.

It is an arithmetic number, because the mean of its divisors is an integer number (1613571750).

Almost surely, 2^12561587503 is an apocalyptic number.

12561587503 is a deficient number, since it is larger than the sum of its proper divisors (346986497).

12561587503 is an equidigital number, since it uses as much as digits as its factorization.

12561587503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966857.

The product of its (nonzero) digits is 252000, while the sum is 43.

The spelling of 12561587503 in words is "twelve billion, five hundred sixty-one million, five hundred eighty-seven thousand, five hundred three".