128866365398 has 16 divisors (see below), whose sum is σ = 193924523520. Its totient is φ = 64225067136.

The previous prime is 128866365379. The next prime is 128866365413. The reversal of 128866365398 is 893563668821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1202558 + ... + 1305326.

It is an arithmetic number, because the mean of its divisors is an integer number (12120282720).

Almost surely, 2^128866365398 is an apocalyptic number.

128866365398 is a deficient number, since it is larger than the sum of its proper divisors (65058158122).

128866365398 is a wasteful number, since it uses less digits than its factorization.

128866365398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104791.

The product of its digits is 89579520, while the sum is 65.

The spelling of 128866365398 in words is "one hundred twenty-eight billion, eight hundred sixty-six million, three hundred sixty-five thousand, three hundred ninety-eight".