6665155 has 16 divisors (see below), whose sum is σ = 9437184. Its totient is φ = 4422240.

The previous prime is 6665123. The next prime is 6665159. The reversal of 6665155 is 5515666.

It is not a de Polignac number, because 6665155 - 2⁵ = 6665123 is a prime.

It is a Duffinian number.

6665155 is a lucky number.

It is a plaindrome in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 6665155.

It is not an unprimeable number, because it can be changed into a prime (6665159) by changing a digit.

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, 1987 + ... + 4156.

It is an arithmetic number, because the mean of its divisors is an integer number (589824).

Almost surely, 2^6665155 is an apocalyptic number.

6665155 is a deficient number, since it is larger than the sum of its proper divisors (2772029).

6665155 is a wasteful number, since it uses less digits than its factorization.

6665155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6186.

The product of its digits is 27000, while the sum is 34.

The square root of 6665155 is about 2581.6961478842. The cubic root of 6665155 is about 188.1929793729.

The spelling of 6665155 in words is "six million, six hundred sixty-five thousand, one hundred fifty-five".