4428128608991 has 2 divisors, whose sum is σ = 4428128608992. Its totient is φ = 4428128608990.

The previous prime is 4428128608921. The next prime is 4428128609119. The reversal of 4428128608991 is 1998068218244.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4428128608991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4428128608921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2214064304495 + 2214064304496.

It is an arithmetic number, because the mean of its divisors is an integer number (2214064304496).

Almost surely, 2^{4428128608991} is an apocalyptic number.

4428128608991 is a deficient number, since it is larger than the sum of its proper divisors (1).

4428128608991 is an equidigital number, since it uses as much as digits as its factorization.

4428128608991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15925248, while the sum is 62.

The spelling of 4428128608991 in words is "four trillion, four hundred twenty-eight billion, one hundred twenty-eight million, six hundred eight thousand, nine hundred ninety-one".