1111111666 has 8 divisors (see below), whose sum is σ = 1904762880. Its totient is φ = 476190708.

The previous prime is 1111111657. The next prime is 1111111667. The reversal of 1111111666 is 6661111111.

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

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1111111666.

It is not an unprimeable number, because it can be changed into a prime (1111111667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39682546 + ... + 39682573.

It is an arithmetic number, because the mean of its divisors is an integer number (238095360).

Almost surely, 2^1111111666 is an apocalyptic number.

1111111666 is a deficient number, since it is larger than the sum of its proper divisors (793651214).

1111111666 is an equidigital number, since it uses as much as digits as its factorization.

1111111666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79365128.

The product of its digits is 216, while the sum is 25.

The square root of 1111111666 is about 33333.3416566656. The cubic root of 1111111666 is about 1035.7443410681.

Adding to 1111111666 its reverse (6661111111), we get a palindrome (7772222777).

The spelling of 1111111666 in words is "one billion, one hundred eleven million, one hundred eleven thousand, six hundred sixty-six".