6663623 has 8 divisors (see below), whose sum is σ = 7038720. Its totient is φ = 6291000.

The previous prime is 6663617. The next prime is 6663647. The reversal of 6663623 is 3263666.

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 6663623 - 2¹⁴ = 6647239 is a prime.

It is a super-2 number, since 2×6663623² = 88807742972258, which contains 22 as substring.

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 6663623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6663653) 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, 8498 + ... + 9248.

It is an arithmetic number, because the mean of its divisors is an integer number (879840).

Almost surely, 2^6663623 is an apocalyptic number.

6663623 is a deficient number, since it is larger than the sum of its proper divisors (375097).

6663623 is a wasteful number, since it uses less digits than its factorization.

6663623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237.

The product of its digits is 23328, while the sum is 32.

The square root of 6663623 is about 2581.3994266676. The cubic root of 6663623 is about 188.1785594163.

The spelling of 6663623 in words is "six million, six hundred sixty-three thousand, six hundred twenty-three".