2805421863128 has 8 divisors (see below), whose sum is σ = 5260165993380. Its totient is φ = 1402710931560.

The previous prime is 2805421863121. The next prime is 2805421863151. The reversal of 2805421863128 is 8213681245082.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805421863121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175338866438 + ... + 175338866453.

Almost surely, 2^{2805421863128} is an apocalyptic number.

It is an amenable number.

2805421863128 is a deficient number, since it is larger than the sum of its proper divisors (2454744130252).

2805421863128 is a wasteful number, since it uses less digits than its factorization.

2805421863128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350677732897 (or 350677732893 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 50.

The spelling of 2805421863128 in words is "two trillion, eight hundred five billion, four hundred twenty-one million, eight hundred sixty-three thousand, one hundred twenty-eight".