12557008820 has 24 divisors (see below), whose sum is σ = 26630809128. Its totient is φ = 4973072000.

The previous prime is 12557008817. The next prime is 12557008873. The reversal of 12557008820 is 2880075521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4508048164 + 8048960656 = 67142^2 + 89716^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3106151 + ... + 3110190.

It is an arithmetic number, because the mean of its divisors is an integer number (1109617047).

Almost surely, 2^12557008820 is an apocalyptic number.

12557008820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12557008820 is an abundant number, since it is smaller than the sum of its proper divisors (14073800308).

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

12557008820 is a wasteful number, since it uses less digits than its factorization.

12557008820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6216451 (or 6216449 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 38.

The spelling of 12557008820 in words is "twelve billion, five hundred fifty-seven million, eight thousand, eight hundred twenty".