1280820328066 has 8 divisors (see below), whose sum is σ = 2022347886480. Its totient is φ = 606704365908.

The previous prime is 1280820328043. The next prime is 1280820328069. The reversal of 1280820328066 is 6608230280821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1280820328069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16852899016 + ... + 16852899091.

It is an arithmetic number, because the mean of its divisors is an integer number (252793485810).

Almost surely, 2^{1280820328066} is an apocalyptic number.

1280820328066 is a deficient number, since it is larger than the sum of its proper divisors (741527558414).

1280820328066 is a wasteful number, since it uses less digits than its factorization.

1280820328066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33705798128.

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 1280820328066 in words is "one trillion, two hundred eighty billion, eight hundred twenty million, three hundred twenty-eight thousand, sixty-six".