12551361540 has 96 divisors (see below), whose sum is σ = 35719004160. Its totient is φ = 3292464000.

The previous prime is 12551361517. The next prime is 12551361551. The reversal of 12551361540 is 4516315521.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2037465 + ... + 2043615.

It is an arithmetic number, because the mean of its divisors is an integer number (372072960).

Almost surely, 2^12551361540 is an apocalyptic number.

12551361540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12551361540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17859502080).

12551361540 is an abundant number, since it is smaller than the sum of its proper divisors (23167642620).

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

12551361540 is a wasteful number, since it uses less digits than its factorization.

12551361540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6713 (or 6711 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 12551361540 in words is "twelve billion, five hundred fifty-one million, three hundred sixty-one thousand, five hundred forty".