1281199954944 has 1056 divisors, whose sum is σ = 4770360241920. Its totient is φ = 301135822848.

The previous prime is 1281199954819. The next prime is 1281199954981. The reversal of 1281199954944 is 4494599911821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 632066059 + ... + 632068085.

Almost surely, 2^{1281199954944} is an apocalyptic number.

1281199954944 is a gapful number since it is divisible by the number (14) 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 1281199954944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2385180120960).

1281199954944 is an abundant number, since it is smaller than the sum of its proper divisors (3489160286976).

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

1281199954944 is a wasteful number, since it uses less digits than its factorization.

1281199954944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113 (or 2088 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 66.

The spelling of 1281199954944 in words is "one trillion, two hundred eighty-one billion, one hundred ninety-nine million, nine hundred fifty-four thousand, nine hundred forty-four".