1281217996800 has 1152 divisors, whose sum is σ = 5553244569600. Its totient is φ = 283336704000.

The previous prime is 1281217996763. The next prime is 1281217996811. The reversal of 1281217996800 is 86997121821.

It is a happy number.

1281217996800 is a `hidden beast` number, since 1 + 281 + 217 + 99 + 68 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 299978665 + ... + 299982935.

It is an arithmetic number, because the mean of its divisors is an integer number (4820524800).

Almost surely, 2^{1281217996800} is an apocalyptic number.

1281217996800 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 1281217996800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2776622284800).

1281217996800 is an abundant number, since it is smaller than the sum of its proper divisors (4272026572800).

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

1281217996800 is a wasteful number, since it uses less digits than its factorization.

1281217996800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4350 (or 4319 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 1281217996800 in words is "one trillion, two hundred eighty-one billion, two hundred seventeen million, nine hundred ninety-six thousand, eight hundred".