6620165 has 4 divisors (see below), whose sum is σ = 7944204. Its totient is φ = 5296128.

The previous prime is 6620101. The next prime is 6620171. The reversal of 6620165 is 5610266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3740356 + 2879809 = 1934^2 + 1697^2 .

It is a cyclic number.

It is not a de Polignac number, because 6620165 - 2⁶ = 6620101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662012 + ... + 662021.

It is an arithmetic number, because the mean of its divisors is an integer number (1986051).

Almost surely, 2^6620165 is an apocalyptic number.

It is an amenable number.

6620165 is a deficient number, since it is larger than the sum of its proper divisors (1324039).

6620165 is a wasteful number, since it uses less digits than its factorization.

6620165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1324038.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 6620165 is about 2572.9681303895. The cubic root of 6620165 is about 187.7685869271.

It can be divided in two parts, 66201 and 65, that added together give a palindrome (66266).

The spelling of 6620165 in words is "six million, six hundred twenty thousand, one hundred sixty-five".