665113 has 2 divisors, whose sum is σ = 665114. Its totient is φ = 665112.

The previous prime is 665111. The next prime is 665117. The reversal of 665113 is 311566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 582169 + 82944 = 763^2 + 288^2 .

It is a cyclic number.

It is not a de Polignac number, because 665113 - 2¹ = 665111 is a prime.

Together with 665111, it forms a pair of twin primes.

665113 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (665111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332556 + 332557.

It is an arithmetic number, because the mean of its divisors is an integer number (332557).

2⁶⁶⁵¹¹³ is an apocalyptic number.

It is an amenable number.

665113 is a deficient number, since it is larger than the sum of its proper divisors (1).

665113 is an equidigital number, since it uses as much as digits as its factorization.

665113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 22.

The square root of 665113 is about 815.5446033173. The cubic root of 665113 is about 87.2901310449.

Adding to 665113 its reverse (311566), we get a palindrome (976679).

The spelling of 665113 in words is "six hundred sixty-five thousand, one hundred thirteen".