6661886 has 32 divisors (see below), whose sum is σ = 12579840. Its totient is φ = 2570400.

The previous prime is 6661883. The next prime is 6661891. The reversal of 6661886 is 6881666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661883) 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, 27755 + ... + 27993.

It is an arithmetic number, because the mean of its divisors is an integer number (393120).

Almost surely, 2^6661886 is an apocalyptic number.

6661886 is a deficient number, since it is larger than the sum of its proper divisors (5917954).

6661886 is a wasteful number, since it uses less digits than its factorization.

6661886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440.

The product of its digits is 82944, while the sum is 41.

The square root of 6661886 is about 2581.0629593251. The cubic root of 6661886 is about 188.1622072226.

It can be divided in two parts, 666 and 1886, that added together give a palindrome (2552).

The spelling of 6661886 in words is "six million, six hundred sixty-one thousand, eight hundred eighty-six".