1666001111 has 8 divisors (see below), whose sum is σ = 1761553920. Its totient is φ = 1571235192.

The previous prime is 1666001107. The next prime is 1666001119. The reversal of 1666001111 is 1111006661.

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

It is a cyclic number.

It is not a de Polignac number, because 1666001111 - 2² = 1666001107 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 (1666001119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192365 + ... + 200838.

It is an arithmetic number, because the mean of its divisors is an integer number (220194240).

Almost surely, 2^1666001111 is an apocalyptic number.

1666001111 is a deficient number, since it is larger than the sum of its proper divisors (95552809).

1666001111 is a wasteful number, since it uses less digits than its factorization.

1666001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393445.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1666001111 is about 40816.6768735526. The cubic root of 1666001111 is about 1185.4732597847.

Adding to 1666001111 its reverse (1111006661), we get a palindrome (2777007772).

The spelling of 1666001111 in words is "one billion, six hundred sixty-six million, one thousand, one hundred eleven".