6699861 has 16 divisors (see below), whose sum is σ = 11344000. Its totient is φ = 3828384.

The previous prime is 6699859. The next prime is 6699871. The reversal of 6699861 is 1689966.

It is not a de Polignac number, because 6699861 - 2¹ = 6699859 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 (6699821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17536 + ... + 17913.

It is an arithmetic number, because the mean of its divisors is an integer number (709000).

Almost surely, 2^6699861 is an apocalyptic number.

It is an amenable number.

6699861 is a deficient number, since it is larger than the sum of its proper divisors (4644139).

6699861 is a wasteful number, since it uses less digits than its factorization.

6699861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35465 (or 35459 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 6699861 is about 2588.4089707772. The cubic root of 6699861 is about 188.5190593950.

The spelling of 6699861 in words is "six million, six hundred ninety-nine thousand, eight hundred sixty-one".