1281356865360 has 720 divisors, whose sum is σ = 5282621390592. Its totient is φ = 286730357760.

The previous prime is 1281356865319. The next prime is 1281356865379. The reversal of 1281356865360 is 635686531821.

It is a happy number.

1281356865360 is a `hidden beast` number, since 1 + 2 + 8 + 13 + 568 + 6 + 5 + 3 + 60 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

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

It is a junction number, because it is equal to n+sod(n) for n = 1281356865297 and 1281356865306.

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 143 ways as a sum of consecutive naturals, for example, 30558169 + ... + 30600071.

Almost surely, 2^{1281356865360} is an apocalyptic number.

1281356865360 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 1281356865360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2641310695296).

1281356865360 is an abundant number, since it is smaller than the sum of its proper divisors (4001264525232).

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

1281356865360 is a wasteful number, since it uses less digits than its factorization.

1281356865360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41966 (or 41937 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 1281356865360 in words is "one trillion, two hundred eighty-one billion, three hundred fifty-six million, eight hundred sixty-five thousand, three hundred sixty".