6601663 has 8 divisors (see below), whose sum is σ = 6724656. Its totient is φ = 6480000.

The previous prime is 6601649. The next prime is 6601691. The reversal of 6601663 is 3661066.

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 6601663 - 2⁵ = 6601631 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 (6601633) 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, 16263 + ... + 16663.

It is an arithmetic number, because the mean of its divisors is an integer number (840582).

Almost surely, 2^6601663 is an apocalyptic number.

6601663 is a deficient number, since it is larger than the sum of its proper divisors (122993).

6601663 is a wasteful number, since it uses less digits than its factorization.

6601663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 6601663 is about 2569.3701562834. The cubic root of 6601663 is about 187.5934988495.

The spelling of 6601663 in words is "six million, six hundred one thousand, six hundred sixty-three".