665131186884 has 12 divisors (see below), whose sum is σ = 1551972769424. Its totient is φ = 221710395624.

The previous prime is 665131186789. The next prime is 665131186897. The reversal of 665131186884 is 488681131566.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27713799442 + ... + 27713799465.

Almost surely, 2^665131186884 is an apocalyptic number.

It is an amenable number.

665131186884 is an abundant number, since it is smaller than the sum of its proper divisors (886841582540).

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

665131186884 is a wasteful number, since it uses less digits than its factorization.

665131186884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55427598914 (or 55427598912 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 57.

The spelling of 665131186884 in words is "six hundred sixty-five billion, one hundred thirty-one million, one hundred eighty-six thousand, eight hundred eighty-four".