128281448428463 has 4 divisors (see below), whose sum is σ = 139943398285608. Its totient is φ = 116619498571320.

The previous prime is 128281448428423. The next prime is 128281448428501. The reversal of 128281448428463 is 364824844182821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 128281448428463 - 2²⁰ = 128281447379887 is a prime.

It is a super-3 number, since 3×128281448428463³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 128281448428463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128281448428403) 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, 5830974928556 + ... + 5830974928577.

It is an arithmetic number, because the mean of its divisors is an integer number (34985849571402).

Almost surely, 2^{128281448428463} is an apocalyptic number.

128281448428463 is a deficient number, since it is larger than the sum of its proper divisors (11661949857145).

128281448428463 is a wasteful number, since it uses less digits than its factorization.

128281448428463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11661949857144.

The product of its digits is 150994944, while the sum is 65.

The spelling of 128281448428463 in words is "one hundred twenty-eight trillion, two hundred eighty-one billion, four hundred forty-eight million, four hundred twenty-eight thousand, four hundred sixty-three".