6726661 has 4 divisors (see below), whose sum is σ = 6732000. Its totient is φ = 6721324.

The previous prime is 6726647. The next prime is 6726667. The reversal of 6726661 is 1666276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6726661 - 2¹³ = 6718469 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 (6726667) 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, 390 + ... + 3688.

It is an arithmetic number, because the mean of its divisors is an integer number (1683000).

Almost surely, 2^6726661 is an apocalyptic number.

It is an amenable number.

6726661 is a deficient number, since it is larger than the sum of its proper divisors (5339).

6726661 is a wasteful number, since it uses less digits than its factorization.

6726661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5338.

The product of its digits is 18144, while the sum is 34.

The square root of 6726661 is about 2593.5807294164. The cubic root of 6726661 is about 188.7700889397.

The spelling of 6726661 in words is "six million, seven hundred twenty-six thousand, six hundred sixty-one".