12555493540 has 24 divisors (see below), whose sum is σ = 26369626752. Its totient is φ = 5021608800.

The previous prime is 12555493523. The next prime is 12555493541. The reversal of 12555493540 is 4539455521.

It is not an unprimeable number, because it can be changed into a prime (12555493541) 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, 165157 + ... + 228883.

It is an arithmetic number, because the mean of its divisors is an integer number (1098734448).

Almost surely, 2^12555493540 is an apocalyptic number.

12555493540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12555493540 is an abundant number, since it is smaller than the sum of its proper divisors (13814133212).

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

12555493540 is a wasteful number, since it uses less digits than its factorization.

12555493540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73587 (or 73585 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 12555493540 in words is "twelve billion, five hundred fifty-five million, four hundred ninety-three thousand, five hundred forty".