665809532882 has 18 divisors (see below), whose sum is σ = 1081472395077. Its totient is φ = 307289783736.

The previous prime is 665809532749. The next prime is 665809532923. The reversal of 665809532882 is 288235908566.

It can be written as a sum of positive squares in 2 ways, for example, as 569286849121 + 96522683761 = 754511^2 + 310681^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=576979.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14979263 + ... + 15023645.

Almost surely, 2^665809532882 is an apocalyptic number.

665809532882 is a deficient number, since it is larger than the sum of its proper divisors (415662862195).

665809532882 is an frugal number, since it uses more digits than its factorization.

665809532882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88794 (or 44398 counting only the distinct ones).

The product of its (nonzero) digits is 49766400, while the sum is 62.

The spelling of 665809532882 in words is "six hundred sixty-five billion, eight hundred nine million, five hundred thirty-two thousand, eight hundred eighty-two".