6663381 has 4 divisors (see below), whose sum is σ = 8884512. Its totient is φ = 4442252.

The previous prime is 6663347. The next prime is 6663383. The reversal of 6663381 is 1833666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6663381 - 2⁶ = 6663317 is a prime.

It is a super-2 number, since 2×6663381² = 88801292702322, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663383) 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 3 ways as a sum of consecutive naturals, for example, 1110561 + ... + 1110566.

It is an arithmetic number, because the mean of its divisors is an integer number (2221128).

Almost surely, 2^6663381 is an apocalyptic number.

It is an amenable number.

6663381 is a deficient number, since it is larger than the sum of its proper divisors (2221131).

6663381 is a wasteful number, since it uses less digits than its factorization.

6663381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221130.

The product of its digits is 15552, while the sum is 33.

The square root of 6663381 is about 2581.3525524422. The cubic root of 6663381 is about 188.1762813882.

The spelling of 6663381 in words is "six million, six hundred sixty-three thousand, three hundred eighty-one".