6667661 has 16 divisors (see below), whose sum is σ = 8953728. Its totient is φ = 4795200.

The previous prime is 6667657. The next prime is 6667669. The reversal of 6667661 is 1667666.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6667661 - 2² = 6667657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6667669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2330 + ... + 4331.

It is an arithmetic number, because the mean of its divisors is an integer number (559608).

Almost surely, 2^6667661 is an apocalyptic number.

It is an amenable number.

6667661 is a deficient number, since it is larger than the sum of its proper divisors (2286067).

6667661 is a wasteful number, since it uses less digits than its factorization.

6667661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6692.

The product of its digits is 54432, while the sum is 38.

The square root of 6667661 is about 2582.1814421144. The cubic root of 6667661 is about 188.2165623460.

The spelling of 6667661 in words is "six million, six hundred sixty-seven thousand, six hundred sixty-one".