664117 has 2 divisors, whose sum is σ = 664118. Its totient is φ = 664116.

The previous prime is 664109. The next prime is 664121. The reversal of 664117 is 711466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662596 + 1521 = 814^2 + 39^2 .

It is a cyclic number.

It is not a de Polignac number, because 664117 - 2³ = 664109 is a prime.

664117 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 664091 and 664100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332058 + 332059.

It is an arithmetic number, because the mean of its divisors is an integer number (332059).

2⁶⁶⁴¹¹⁷ is an apocalyptic number.

It is an amenable number.

664117 is a deficient number, since it is larger than the sum of its proper divisors (1).

664117 is an equidigital number, since it uses as much as digits as its factorization.

664117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 25.

The square root of 664117 is about 814.9337396378. The cubic root of 664117 is about 87.2465372473.

The spelling of 664117 in words is "six hundred sixty-four thousand, one hundred seventeen".