6650663 has 4 divisors (see below), whose sum is σ = 6659568. Its totient is φ = 6641760.

The previous prime is 6650659. The next prime is 6650671. The reversal of 6650663 is 3660566.

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 6650663 - 2² = 6650659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6650603) 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, 3218 + ... + 4863.

It is an arithmetic number, because the mean of its divisors is an integer number (1664892).

Almost surely, 2^6650663 is an apocalyptic number.

6650663 is a deficient number, since it is larger than the sum of its proper divisors (8905).

6650663 is an equidigital number, since it uses as much as digits as its factorization.

6650663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8904.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 6650663 is about 2578.8879386278. The cubic root of 6650663 is about 188.0564848381.

The spelling of 6650663 in words is "six million, six hundred fifty thousand, six hundred sixty-three".