6663667 has 8 divisors (see below), whose sum is σ = 7040000. Its totient is φ = 6297480.

The previous prime is 6663653. The next prime is 6663673. The reversal of 6663667 is 7663666.

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 6663667 - 2⁷ = 6663539 is a prime.

It is a Duffinian number.

6663667 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6663617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1167 + ... + 3832.

It is an arithmetic number, because the mean of its divisors is an integer number (880000).

Almost surely, 2^6663667 is an apocalyptic number.

6663667 is a deficient number, since it is larger than the sum of its proper divisors (376333).

6663667 is a wasteful number, since it uses less digits than its factorization.

6663667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5073.

The product of its digits is 163296, while the sum is 40.

The square root of 6663667 is about 2581.4079491626. The cubic root of 6663667 is about 188.1789735973.

Subtracting 6663667 from its reverse (7663666), we obtain a palindrome (999999).

The spelling of 6663667 in words is "six million, six hundred sixty-three thousand, six hundred sixty-seven".