6646651 has 12 divisors (see below), whose sum is σ = 7372456. Its totient is φ = 5987520.

The previous prime is 6646613. The next prime is 6646657. The reversal of 6646651 is 1566466.

It is not a de Polignac number, because 6646651 - 2¹³ = 6638459 is a prime.

It is a Duffinian number.

6646651 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6646657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19555 + ... + 19891.

Almost surely, 2^6646651 is an apocalyptic number.

6646651 is a deficient number, since it is larger than the sum of its proper divisors (725805).

6646651 is a wasteful number, since it uses less digits than its factorization.

6646651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 511 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 6646651 is about 2578.1099666228. The cubic root of 6646651 is about 188.0186623242.

The spelling of 6646651 in words is "six million, six hundred forty-six thousand, six hundred fifty-one".