128763205509 has 8 divisors (see below), whose sum is σ = 171688456800. Its totient is φ = 85840045616.

The previous prime is 128763205499. The next prime is 128763205513. The reversal of 128763205509 is 905502367821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128763205509 - 2⁸ = 128763205253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128763200509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373059 + ... + 629840.

It is an arithmetic number, because the mean of its divisors is an integer number (21461057100).

Almost surely, 2^128763205509 is an apocalyptic number.

It is an amenable number.

128763205509 is a deficient number, since it is larger than the sum of its proper divisors (42925251291).

128763205509 is a wasteful number, since it uses less digits than its factorization.

128763205509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045699.

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 128763205509 in words is "one hundred twenty-eight billion, seven hundred sixty-three million, two hundred five thousand, five hundred nine".