128581011199 has 4 divisors (see below), whose sum is σ = 129519558864. Its totient is φ = 127642463536.

The previous prime is 128581011197. The next prime is 128581011203. The reversal of 128581011199 is 991110185821.

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 128581011199 - 2¹ = 128581011197 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 (128581011197) 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, 469273627 + ... + 469273900.

It is an arithmetic number, because the mean of its divisors is an integer number (32379889716).

Almost surely, 2^128581011199 is an apocalyptic number.

128581011199 is a deficient number, since it is larger than the sum of its proper divisors (938547665).

128581011199 is an equidigital number, since it uses as much as digits as its factorization.

128581011199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938547664.

The product of its (nonzero) digits is 51840, while the sum is 46.

The spelling of 128581011199 in words is "one hundred twenty-eight billion, five hundred eighty-one million, eleven thousand, one hundred ninety-nine".