664101 has 12 divisors (see below), whose sum is σ = 969228. Its totient is φ = 438144.

The previous prime is 664099. The next prime is 664109. The reversal of 664101 is 101466.

664101 is a `hidden beast` number, since 664 + 1 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 65025 + 599076 = 255^2 + 774^2 .

It is not a de Polignac number, because 664101 - 2¹ = 664099 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 691 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (80769).

2⁶⁶⁴¹⁰¹ is an apocalyptic number.

It is an amenable number.

664101 is a deficient number, since it is larger than the sum of its proper divisors (305127).

664101 is a wasteful number, since it uses less digits than its factorization.

664101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 769 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 664101 is about 814.9239228296. The cubic root of 664101 is about 87.2458365898.

Adding to 664101 its reverse (101466), we get a palindrome (765567).

The spelling of 664101 in words is "six hundred sixty-four thousand, one hundred one".