1280733408646 has 4 divisors (see below), whose sum is σ = 1921100112972. Its totient is φ = 640366704322.

The previous prime is 1280733408607. The next prime is 1280733408659. The reversal of 1280733408646 is 6468043370821.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 1280733408593 and 1280733408602.

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 as a sum of consecutive naturals, namely, 320183352160 + ... + 320183352163.

It is an arithmetic number, because the mean of its divisors is an integer number (480275028243).

Almost surely, 2^{1280733408646} is an apocalyptic number.

1280733408646 is a deficient number, since it is larger than the sum of its proper divisors (640366704326).

1280733408646 is an equidigital number, since it uses as much as digits as its factorization.

1280733408646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640366704325.

The product of its (nonzero) digits is 4644864, while the sum is 52.

The spelling of 1280733408646 in words is "one trillion, two hundred eighty billion, seven hundred thirty-three million, four hundred eight thousand, six hundred forty-six".