12506721045 has 48 divisors (see below), whose sum is σ = 25068435840. Its totient is φ = 5277557376.

The previous prime is 12506721023. The next prime is 12506721079. The reversal of 12506721045 is 54012760521.

It is not a de Polignac number, because 12506721045 - 2⁵ = 12506721013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12506720997 and 12506721015.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 644905 + ... + 664014.

It is an arithmetic number, because the mean of its divisors is an integer number (522259080).

Almost surely, 2^12506721045 is an apocalyptic number.

12506721045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12506721045 is an abundant number, since it is smaller than the sum of its proper divisors (12561714795).

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

12506721045 is a wasteful number, since it uses less digits than its factorization.

12506721045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308954 (or 1308947 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The spelling of 12506721045 in words is "twelve billion, five hundred six million, seven hundred twenty-one thousand, forty-five".