6657663 has 4 divisors (see below), whose sum is σ = 8876888. Its totient is φ = 4438440.

The previous prime is 6657661. The next prime is 6657667. The reversal of 6657663 is 3667566.

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

It is not a de Polignac number, because 6657663 - 2¹ = 6657661 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6657661) 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, 1109608 + ... + 1109613.

It is an arithmetic number, because the mean of its divisors is an integer number (2219222).

Almost surely, 2^6657663 is an apocalyptic number.

6657663 is a deficient number, since it is larger than the sum of its proper divisors (2219225).

6657663 is a wasteful number, since it uses less digits than its factorization.

6657663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2219224.

The product of its digits is 136080, while the sum is 39.

The square root of 6657663 is about 2580.2447558323. The cubic root of 6657663 is about 188.1224398573.

The spelling of 6657663 in words is "six million, six hundred fifty-seven thousand, six hundred sixty-three".