128428724663 has 4 divisors (see below), whose sum is σ = 128479230048. Its totient is φ = 128378219280.

The previous prime is 128428724653. The next prime is 128428724693. The reversal of 128428724663 is 366427824821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 366427824821 = 433 ⋅846253637.

It is a cyclic number.

It is not a de Polignac number, because 128428724663 - 2²⁶ = 128361615799 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 (128428724653) 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, 25248878 + ... + 25253963.

It is an arithmetic number, because the mean of its divisors is an integer number (32119807512).

Almost surely, 2^128428724663 is an apocalyptic number.

128428724663 is a deficient number, since it is larger than the sum of its proper divisors (50505385).

128428724663 is an equidigital number, since it uses as much as digits as its factorization.

128428724663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50505384.

The product of its digits is 6193152, while the sum is 53.

The spelling of 128428724663 in words is "one hundred twenty-eight billion, four hundred twenty-eight million, seven hundred twenty-four thousand, six hundred sixty-three".