665128130826 has 16 divisors (see below), whose sum is σ = 1358559586944. Its totient is φ = 216992156064.

The previous prime is 665128130803. The next prime is 665128130833. The reversal of 665128130826 is 628031821566.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1179304915 + ... + 1179305478.

It is an arithmetic number, because the mean of its divisors is an integer number (84909974184).

Almost surely, 2^665128130826 is an apocalyptic number.

665128130826 is an abundant number, since it is smaller than the sum of its proper divisors (693431456118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665128130826 is a wasteful number, since it uses less digits than its factorization.

665128130826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358610445.

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 665128130826 in words is "six hundred sixty-five billion, one hundred twenty-eight million, one hundred thirty thousand, eight hundred twenty-six".