1666666886 has 8 divisors (see below), whose sum is σ = 2512691280. Its totient is φ = 829103128.

The previous prime is 1666666873. The next prime is 1666666913. The reversal of 1666666886 is 6886666661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2114666 + ... + 2115453.

It is an arithmetic number, because the mean of its divisors is an integer number (314086410).

Almost surely, 2^1666666886 is an apocalyptic number.

1666666886 is a deficient number, since it is larger than the sum of its proper divisors (846024394).

1666666886 is a wasteful number, since it uses less digits than its factorization.

1666666886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230318.

The product of its digits is 17915904, while the sum is 59.

The square root of 1666666886 is about 40824.8317326600. The cubic root of 1666666886 is about 1185.6311535064.

The spelling of 1666666886 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, eight hundred eighty-six".