128308967663 has 4 divisors (see below), whose sum is σ = 128366949528. Its totient is φ = 128250985800.

The previous prime is 128308967653. The next prime is 128308967671. The reversal of 128308967663 is 366769803821.

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 128308967663 - 2⁶ = 128308967599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128308967603) 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, 28987613 + ... + 28992038.

It is an arithmetic number, because the mean of its divisors is an integer number (32091737382).

Almost surely, 2^128308967663 is an apocalyptic number.

128308967663 is a deficient number, since it is larger than the sum of its proper divisors (57981865).

128308967663 is an equidigital number, since it uses as much as digits as its factorization.

128308967663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57981864.

The product of its (nonzero) digits is 15676416, while the sum is 59.

The spelling of 128308967663 in words is "one hundred twenty-eight billion, three hundred eight million, nine hundred sixty-seven thousand, six hundred sixty-three".