12405542540 has 48 divisors (see below), whose sum is σ = 26172199872. Its totient is φ = 4939309056.

The previous prime is 12405542533. The next prime is 12405542579. The reversal of 12405542540 is 4524550421.

It is a junction number, because it is equal to n+sod(n) for n = 12405542497 and 12405542506.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5131412 + ... + 5133828.

It is an arithmetic number, because the mean of its divisors is an integer number (545254164).

Almost surely, 2^12405542540 is an apocalyptic number.

12405542540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12405542540 is an abundant number, since it is smaller than the sum of its proper divisors (13766657332).

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

12405542540 is a wasteful number, since it uses less digits than its factorization.

12405542540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506 (or 3504 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 32.

The spelling of 12405542540 in words is "twelve billion, four hundred five million, five hundred forty-two thousand, five hundred forty".