6651165 has 16 divisors (see below), whose sum is σ = 11268288. Its totient is φ = 3338496.

The previous prime is 6651149. The next prime is 6651167. The reversal of 6651165 is 5611566.

It is not a de Polignac number, because 6651165 - 2⁴ = 6651149 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12787 + ... + 13296.

It is an arithmetic number, because the mean of its divisors is an integer number (704268).

Almost surely, 2^6651165 is an apocalyptic number.

It is an amenable number.

6651165 is a deficient number, since it is larger than the sum of its proper divisors (4617123).

6651165 is a wasteful number, since it uses less digits than its factorization.

6651165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26108.

The product of its digits is 5400, while the sum is 30.

The square root of 6651165 is about 2578.9852655647. The cubic root of 6651165 is about 188.0612162952.

It can be divided in two parts, 665 and 1165, that added together give a triangular number (1830 = T₆₀).

The spelling of 6651165 in words is "six million, six hundred fifty-one thousand, one hundred sixty-five".