6663291 has 4 divisors (see below), whose sum is σ = 8884392. Its totient is φ = 4442192.

The previous prime is 6663289. The next prime is 6663299. The reversal of 6663291 is 1923666.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6663291 - 2¹ = 6663289 is a prime.

It is a D-number.

6663291 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6663299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110546 + ... + 1110551.

It is an arithmetic number, because the mean of its divisors is an integer number (2221098).

Almost surely, 2^6663291 is an apocalyptic number.

6663291 is a deficient number, since it is larger than the sum of its proper divisors (2221101).

6663291 is a wasteful number, since it uses less digits than its factorization.

6663291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221100.

The product of its digits is 11664, while the sum is 33.

The square root of 6663291 is about 2581.3351196619. The cubic root of 6663291 is about 188.1754341735.

The spelling of 6663291 in words is "six million, six hundred sixty-three thousand, two hundred ninety-one".