665115 has 32 divisors (see below), whose sum is σ = 1209600. Its totient is φ = 309120.

The previous prime is 665113. The next prime is 665117. The reversal of 665115 is 511566.

It is an interprime number because it is at equal distance from previous prime (665113) and next prime (665117).

It is not a de Polignac number, because 665115 - 2¹ = 665113 is a prime.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 665115.

It is not an unprimeable number, because it can be changed into a prime (665111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4716 + ... + 4854.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2⁶⁶⁵¹¹⁵ is an apocalyptic number.

665115 is a deficient number, since it is larger than the sum of its proper divisors (544485).

665115 is a wasteful number, since it uses less digits than its factorization.

665115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187.

The product of its digits is 900, while the sum is 24.

The square root of 665115 is about 815.5458294909. The cubic root of 665115 is about 87.2902185388.

It can be divided in two parts, 6651 and 15, that added together give a palindrome (6666).

The spelling of 665115 in words is "six hundred sixty-five thousand, one hundred fifteen".