12540420504 has 96 divisors (see below), whose sum is σ = 34753914000. Its totient is φ = 4083805440.

The previous prime is 12540420493. The next prime is 12540420523. The reversal of 12540420504 is 40502404521.

It is a super-2 number, since 2×12540420504² (a number of 21 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 644827 + ... + 663989.

Almost surely, 2^12540420504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12540420504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17376957000).

12540420504 is an abundant number, since it is smaller than the sum of its proper divisors (22213493496).

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

12540420504 is a wasteful number, since it uses less digits than its factorization.

12540420504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19385 (or 19378 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The spelling of 12540420504 in words is "twelve billion, five hundred forty million, four hundred twenty thousand, five hundred four".