6663605 has 16 divisors (see below), whose sum is σ = 8891904. Its totient is φ = 4760640.

The previous prime is 6663599. The next prime is 6663611. The reversal of 6663605 is 5063666.

6663605 = T₁₀₀₆ + T₁₀₀₇ + ... + T₁₀₁₈.

It is an interprime number because it is at equal distance from previous prime (6663599) and next prime (6663611).

It is not a de Polignac number, because 6663605 - 2¹⁰ = 6662581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 362 + ... + 3668.

It is an arithmetic number, because the mean of its divisors is an integer number (555744).

Almost surely, 2^6663605 is an apocalyptic number.

6663605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6663605 is a deficient number, since it is larger than the sum of its proper divisors (2228299).

6663605 is a wasteful number, since it uses less digits than its factorization.

6663605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356.

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

The square root of 6663605 is about 2581.3959401843. The cubic root of 6663605 is about 188.1783899781.

The spelling of 6663605 in words is "six million, six hundred sixty-three thousand, six hundred five".