12540530500 has 48 divisors (see below), whose sum is σ = 27426685104. Its totient is φ = 5009222400.

The previous prime is 12540530491. The next prime is 12540530543. The reversal of 12540530500 is 503504521.

It can be written as a sum of positive squares in 8 ways, for example, as 114244 + 12540416256 = 338^2 + 111984^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

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 15 ways as a sum of consecutive naturals, for example, 349392 + ... + 383608.

It is an arithmetic number, because the mean of its divisors is an integer number (571389273).

Almost surely, 2^12540530500 is an apocalyptic number.

12540530500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12540530500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13713342552).

12540530500 is an abundant number, since it is smaller than the sum of its proper divisors (14886154604).

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

12540530500 is a wasteful number, since it uses less digits than its factorization.

12540530500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34969 (or 34957 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The spelling of 12540530500 in words is "twelve billion, five hundred forty million, five hundred thirty thousand, five hundred".