6670561 has 4 divisors (see below), whose sum is σ = 6675732. Its totient is φ = 6665392.

The previous prime is 6670553. The next prime is 6670583. The reversal of 6670561 is 1650766.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3041536 + 3629025 = 1744^2 + 1905^2 .

It is a cyclic number.

It is not a de Polignac number, because 6670561 - 2³ = 6670553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6670661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1131 + ... + 3823.

It is an arithmetic number, because the mean of its divisors is an integer number (1668933).

Almost surely, 2^6670561 is an apocalyptic number.

It is an amenable number.

6670561 is a deficient number, since it is larger than the sum of its proper divisors (5171).

6670561 is a wasteful number, since it uses less digits than its factorization.

6670561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5170.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 6670561 is about 2582.7429217791. The cubic root of 6670561 is about 188.2438457225.

It can be divided in two parts, 66705 and 61, that added together give a palindrome (66766).

The spelling of 6670561 in words is "six million, six hundred seventy thousand, five hundred sixty-one".