1666024111 has 4 divisors (see below), whose sum is σ = 1666106352. Its totient is φ = 1665941872.

The previous prime is 1666024099. The next prime is 1666024153. The reversal of 1666024111 is 1114206661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1114206661 = 1091 ⋅1021271.

It is a cyclic number.

It is not a de Polignac number, because 1666024111 - 2⁵ = 1666024079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666024111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664024111) 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, 13086 + ... + 59188.

It is an arithmetic number, because the mean of its divisors is an integer number (416526588).

Almost surely, 2^1666024111 is an apocalyptic number.

1666024111 is a deficient number, since it is larger than the sum of its proper divisors (82241).

1666024111 is an equidigital number, since it uses as much as digits as its factorization.

1666024111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82240.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1666024111 is about 40816.9586201618. The cubic root of 1666024111 is about 1185.4787151151.

The spelling of 1666024111 in words is "one billion, six hundred sixty-six million, twenty-four thousand, one hundred eleven".