6666121 has 8 divisors (see below), whose sum is σ = 8311104. Its totient is φ = 5194320.

The previous prime is 6666097. The next prime is 6666133. The reversal of 6666121 is 1216666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6666121 - 2¹³ = 6657929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6666121.

It is not an unprimeable number, because it can be changed into a prime (6663121) 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 7 ways as a sum of consecutive naturals, for example, 43210 + ... + 43363.

It is an arithmetic number, because the mean of its divisors is an integer number (1038888).

Almost surely, 2^6666121 is an apocalyptic number.

It is an amenable number.

6666121 is a deficient number, since it is larger than the sum of its proper divisors (1644983).

6666121 is a wasteful number, since it uses less digits than its factorization.

6666121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86591.

The product of its digits is 2592, while the sum is 28.

The square root of 6666121 is about 2581.8832274137. The cubic root of 6666121 is about 188.2020707162.

The spelling of 6666121 in words is "six million, six hundred sixty-six thousand, one hundred twenty-one".