1280661632099 has 8 divisors (see below), whose sum is σ = 1283269236480. Its totient is φ = 1278056603656.

The previous prime is 1280661632053. The next prime is 1280661632119. The reversal of 1280661632099 is 9902361660821.

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

It is a cyclic number.

It is not a de Polignac number, because 1280661632099 - 2²⁰ = 1280660583523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280661632099.

It is not an unprimeable number, because it can be changed into a prime (1280661652099) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 352922 + ... + 1638864.

It is an arithmetic number, because the mean of its divisors is an integer number (160408654560).

Almost surely, 2^{1280661632099} is an apocalyptic number.

1280661632099 is a deficient number, since it is larger than the sum of its proper divisors (2607604381).

1280661632099 is a wasteful number, since it uses less digits than its factorization.

1280661632099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287969.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 1280661632099 in words is "one trillion, two hundred eighty billion, six hundred sixty-one million, six hundred thirty-two thousand, ninety-nine".