12540550220 has 24 divisors (see below), whose sum is σ = 28729261008. Its totient is φ = 4560200000.

The previous prime is 12540550213. The next prime is 12540550247. The reversal of 12540550220 is 2205504521.

It is a self number, because there is not a number n which added to its sum of digits gives 12540550220.

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 7 ways as a sum of consecutive naturals, for example, 28501031 + ... + 28501470.

It is an arithmetic number, because the mean of its divisors is an integer number (1197052542).

Almost surely, 2^12540550220 is an apocalyptic number.

12540550220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12540550220 is an abundant number, since it is smaller than the sum of its proper divisors (16188710788).

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

12540550220 is a wasteful number, since it uses less digits than its factorization.

12540550220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57002521 (or 57002519 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The spelling of 12540550220 in words is "twelve billion, five hundred forty million, five hundred fifty thousand, two hundred twenty".