6669861 has 16 divisors (see below), whose sum is σ = 9745920. Its totient is φ = 4023920.

The previous prime is 6669857. The next prime is 6669863. The reversal of 6669861 is 1689666.

It is a cyclic number.

It is not a de Polignac number, because 6669861 - 2² = 6669857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6669863) 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 15 ways as a sum of consecutive naturals, for example, 11566 + ... + 12128.

It is an arithmetic number, because the mean of its divisors is an integer number (609120).

Almost surely, 2^6669861 is an apocalyptic number.

It is an amenable number.

6669861 is a deficient number, since it is larger than the sum of its proper divisors (3076059).

6669861 is a wasteful number, since it uses less digits than its factorization.

6669861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

The product of its digits is 93312, while the sum is 42.

The square root of 6669861 is about 2582.6074033813. The cubic root of 6669861 is about 188.2372608040.

The spelling of 6669861 in words is "six million, six hundred sixty-nine thousand, eight hundred sixty-one".