1660105 has 12 divisors (see below), whose sum is σ = 2080260. Its totient is φ = 1270304.

The previous prime is 1660103. The next prime is 1660111. The reversal of 1660105 is 5010661.

It can be written as a sum of positive squares in 2 ways, for example, as 732736 + 927369 = 856^2 + 963^2 .

It is not a de Polignac number, because 1660105 - 2¹ = 1660103 is a prime.

It is a super-2 number, since 2×1660105² = 5511897222050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15462 + ... + 15568.

It is an arithmetic number, because the mean of its divisors is an integer number (173355).

2^1660105 is an apocalyptic number.

It is an amenable number.

1660105 is a deficient number, since it is larger than the sum of its proper divisors (420155).

1660105 is an equidigital number, since it uses as much as digits as its factorization.

1660105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1660105 is about 1288.4506199308. The cubic root of 1660105 is about 118.4073111887.

Adding to 1660105 its reverse (5010661), we get a palindrome (6670766).

The spelling of 1660105 in words is "one million, six hundred sixty thousand, one hundred five".