12561280336 has 40 divisors (see below), whose sum is σ = 26793597600. Its totient is φ = 5657281920.

The previous prime is 12561280279. The next prime is 12561280343. The reversal of 12561280336 is 63308216521.

It is a junction number, because it is equal to n+sod(n) for n = 12561280295 and 12561280304.

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 7 ways as a sum of consecutive naturals, for example, 308206 + ... + 346573.

It is an arithmetic number, because the mean of its divisors is an integer number (669839940).

Almost surely, 2^12561280336 is an apocalyptic number.

12561280336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12561280336 is an abundant number, since it is smaller than the sum of its proper divisors (14232317264).

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

12561280336 is a wasteful number, since it uses less digits than its factorization.

12561280336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654907 (or 654901 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 12561280336 its reverse (63308216521), we get a palindrome (75869496857).

The spelling of 12561280336 in words is "twelve billion, five hundred sixty-one million, two hundred eighty thousand, three hundred thirty-six".