128818022099 has 4 divisors (see below), whose sum is σ = 138727100736. Its totient is φ = 118908943464.

The previous prime is 128818022093. The next prime is 128818022101. The reversal of 128818022099 is 990220818821.

It is a happy number.

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 128818022099 - 2¹⁶ = 128817956563 is a prime.

It is a super-4 number, since 4×128818022099⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128818022093) 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, 4954539299 + ... + 4954539324.

It is an arithmetic number, because the mean of its divisors is an integer number (34681775184).

Almost surely, 2^128818022099 is an apocalyptic number.

128818022099 is a deficient number, since it is larger than the sum of its proper divisors (9909078637).

128818022099 is an equidigital number, since it uses as much as digits as its factorization.

128818022099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9909078636.

The product of its (nonzero) digits is 331776, while the sum is 50.

The spelling of 128818022099 in words is "one hundred twenty-eight billion, eight hundred eighteen million, twenty-two thousand, ninety-nine".