12461557888 has 64 divisors (see below), whose sum is σ = 26789779800. Its totient is φ = 5739798528.

The previous prime is 12461557879. The next prime is 12461557903. The reversal of 12461557888 is 88875516421.

It can be written as a sum of positive squares in 4 ways, for example, as 11421624384 + 1039933504 = 106872^2 + 32248^2 .

It is a tau number, because it is divible by the number of its divisors (64).

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, 839620 + ... + 854332.

Almost surely, 2^12461557888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12461557888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13394889900).

12461557888 is an abundant number, since it is smaller than the sum of its proper divisors (14328221912).

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

12461557888 is a wasteful number, since it uses less digits than its factorization.

12461557888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15249 (or 15237 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 55.

The spelling of 12461557888 in words is "twelve billion, four hundred sixty-one million, five hundred fifty-seven thousand, eight hundred eighty-eight".