1660065 has 16 divisors (see below), whose sum is σ = 2897856. Its totient is φ = 804800.

The previous prime is 1660063. The next prime is 1660069. The reversal of 1660065 is 5600661.

It is not a de Polignac number, because 1660065 - 2¹ = 1660063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1660063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4866 + ... + 5195.

It is an arithmetic number, because the mean of its divisors is an integer number (181116).

2^1660065 is an apocalyptic number.

1660065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1660065 is a deficient number, since it is larger than the sum of its proper divisors (1237791).

1660065 is a wasteful number, since it uses less digits than its factorization.

1660065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10080.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 1660065 is about 1288.4350973177. The cubic root of 1660065 is about 118.4063601785.

It can be divided in two parts, 1 and 660065, that added together give a palindrome (660066).

The spelling of 1660065 in words is "one million, six hundred sixty thousand, sixty-five".