12661240800 has 288 divisors, whose sum is σ = 44580146688. Its totient is φ = 3102750720.

The previous prime is 12661240777. The next prime is 12661240847. The reversal of 12661240800 is 804216621.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8204829 + ... + 8206371.

It is an arithmetic number, because the mean of its divisors is an integer number (154792176).

Almost surely, 2^12661240800 is an apocalyptic number.

12661240800 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 12661240800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22290073344).

12661240800 is an abundant number, since it is smaller than the sum of its proper divisors (31918905888).

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

12661240800 is a wasteful number, since it uses less digits than its factorization.

12661240800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842 (or 1829 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The spelling of 12661240800 in words is "twelve billion, six hundred sixty-one million, two hundred forty thousand, eight hundred".