1660111 has 2 divisors, whose sum is σ = 1660112. Its totient is φ = 1660110.

The previous prime is 1660103. The next prime is 1660121. The reversal of 1660111 is 1110661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1660111 - 2³ = 1660103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1660121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830055 + 830056.

It is an arithmetic number, because the mean of its divisors is an integer number (830056).

2^1660111 is an apocalyptic number.

1660111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660111 is an equidigital number, since it uses as much as digits as its factorization.

1660111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1660111 is about 1288.4529483066. The cubic root of 1660111 is about 118.4074538389.

Adding to 1660111 its reverse (1110661), we get a palindrome (2770772).

It can be divided in two parts, 1660 and 111, that added together give a palindrome (1771).

The spelling of 1660111 in words is "one million, six hundred sixty thousand, one hundred eleven".