6668121 has 16 divisors (see below), whose sum is σ = 9155520. Its totient is φ = 4315200.

The previous prime is 6668119. The next prime is 6668149. The reversal of 6668121 is 1218666.

It is not a de Polignac number, because 6668121 - 2¹ = 6668119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6668161) 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, 17691 + ... + 18063.

It is an arithmetic number, because the mean of its divisors is an integer number (572220).

Almost surely, 2^6668121 is an apocalyptic number.

It is an amenable number.

6668121 is a deficient number, since it is larger than the sum of its proper divisors (2487399).

6668121 is a wasteful number, since it uses less digits than its factorization.

6668121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536.

The product of its digits is 3456, while the sum is 30.

The square root of 6668121 is about 2582.2705125529. The cubic root of 6668121 is about 188.2208905818.

It can be divided in two parts, 66681 and 21, that multiplied together give a triangular number (1400301 = T₁₆₇₃).

The spelling of 6668121 in words is "six million, six hundred sixty-eight thousand, one hundred twenty-one".