12661250400 has 288 divisors, whose sum is σ = 48203164800. Its totient is φ = 3198528000.

The previous prime is 12661250359. The next prime is 12661250411. The reversal of 12661250400 is 405216621.

12661250400 is a `hidden beast` number, since 1 + 2 + 6 + 6 + 1 + 250 + 400 = 666.

12661250400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 394975 + ... + 425825.

It is an arithmetic number, because the mean of its divisors is an integer number (167372100).

Almost surely, 2^12661250400 is an apocalyptic number.

12661250400 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 12661250400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24101582400).

12661250400 is an abundant number, since it is smaller than the sum of its proper divisors (35541914400).

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

12661250400 is a wasteful number, since it uses less digits than its factorization.

12661250400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30899 (or 30880 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 12661250400 in words is "twelve billion, six hundred sixty-one million, two hundred fifty thousand, four hundred".