6669581 has 4 divisors (see below), whose sum is σ = 6694464. Its totient is φ = 6644700.

The previous prime is 6669547. The next prime is 6669587. The reversal of 6669581 is 1859666.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6669581 is a prime.

It is a super-2 number, since 2×6669581² = 88966621431122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6669587) 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, 12035 + ... + 12576.

It is an arithmetic number, because the mean of its divisors is an integer number (1673616).

Almost surely, 2^6669581 is an apocalyptic number.

It is an amenable number.

6669581 is a deficient number, since it is larger than the sum of its proper divisors (24883).

6669581 is a wasteful number, since it uses less digits than its factorization.

6669581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24882.

The product of its digits is 77760, while the sum is 41.

The square root of 6669581 is about 2582.5531940311. The cubic root of 6669581 is about 188.2346267076.

The spelling of 6669581 in words is "six million, six hundred sixty-nine thousand, five hundred eighty-one".