665086128 has 80 divisors (see below), whose sum is σ = 1966469376. Its totient is φ = 189745920.

The previous prime is 665086099. The next prime is 665086199. The reversal of 665086128 is 821680566.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 665086128.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366343 + ... + 368153.

Almost surely, 2^665086128 is an apocalyptic number.

It is an amenable number.

665086128 is an abundant number, since it is smaller than the sum of its proper divisors (1301383248).

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

665086128 is a wasteful number, since it uses less digits than its factorization.

665086128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922 (or 2916 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 665086128 is about 25789.2638126799. The cubic root of 665086128 is about 872.8895545917.

The spelling of 665086128 in words is "six hundred sixty-five million, eighty-six thousand, one hundred twenty-eight".