1664116 has 12 divisors (see below), whose sum is σ = 2921380. Its totient is φ = 829440.

The previous prime is 1664101. The next prime is 1664123. The reversal of 1664116 is 6114661.

It can be written as a sum of positive squares in 2 ways, for example, as 656100 + 1008016 = 810^2 + 1004^2 .

It is a super-2 number, since 2×1664116² = 5538564122912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1780 + ... + 2548.

2^1664116 is an apocalyptic number.

It is an amenable number.

1664116 is a deficient number, since it is larger than the sum of its proper divisors (1257264).

1664116 is a wasteful number, since it uses less digits than its factorization.

1664116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314 (or 1312 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 1664116 is about 1290.0062015355. The cubic root of 1664116 is about 118.5025962744.

Adding to 1664116 its reverse (6114661), we get a palindrome (7778777).

It can be divided in two parts, 16641 and 16, that multiplied together give a square (266256 = 516²).

The spelling of 1664116 in words is "one million, six hundred sixty-four thousand, one hundred sixteen".