665288895 has 32 divisors (see below), whose sum is σ = 1137242880. Its totient is φ = 331119360.

The previous prime is 665288891. The next prime is 665288909. The reversal of 665288895 is 598882566.

It is not a de Polignac number, because 665288895 - 2² = 665288891 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665288891) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1675 + ... + 36515.

It is an arithmetic number, because the mean of its divisors is an integer number (35538840).

Almost surely, 2^665288895 is an apocalyptic number.

665288895 is a deficient number, since it is larger than the sum of its proper divisors (471953985).

665288895 is a wasteful number, since it uses less digits than its factorization.

665288895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34935.

The product of its digits is 8294400, while the sum is 57.

The square root of 665288895 is about 25793.1947420245. The cubic root of 665288895 is about 872.9782524837.

The spelling of 665288895 in words is "six hundred sixty-five million, two hundred eighty-eight thousand, eight hundred ninety-five".