6663261 has 16 divisors (see below), whose sum is σ = 10114560. Its totient is φ = 3862320.

The previous prime is 6663257. The next prime is 6663289. The reversal of 6663261 is 1623666.

It is not a de Polignac number, because 6663261 - 2² = 6663257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663961) 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, 3631 + ... + 5148.

It is an arithmetic number, because the mean of its divisors is an integer number (632160).

Almost surely, 2^6663261 is an apocalyptic number.

It is an amenable number.

6663261 is a deficient number, since it is larger than the sum of its proper divisors (3451299).

6663261 is a wasteful number, since it uses less digits than its factorization.

6663261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8816.

The product of its digits is 7776, while the sum is 30.

The square root of 6663261 is about 2581.3293087090. The cubic root of 6663261 is about 188.1751517670.

The spelling of 6663261 in words is "six million, six hundred sixty-three thousand, two hundred sixty-one".