128980699691 has 4 divisors (see below), whose sum is σ = 128984485584. Its totient is φ = 128976913800.

The previous prime is 128980699667. The next prime is 128980699697. The reversal of 128980699691 is 196996089821.

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 128980699691 - 2¹⁰ = 128980698667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128980699697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1841375 + ... + 1910136.

It is an arithmetic number, because the mean of its divisors is an integer number (32246121396).

Almost surely, 2^128980699691 is an apocalyptic number.

128980699691 is a deficient number, since it is larger than the sum of its proper divisors (3785893).

128980699691 is an equidigital number, since it uses as much as digits as its factorization.

128980699691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785892.

The product of its (nonzero) digits is 30233088, while the sum is 68.

The spelling of 128980699691 in words is "one hundred twenty-eight billion, nine hundred eighty million, six hundred ninety-nine thousand, six hundred ninety-one".