665042113 has 2 divisors, whose sum is σ = 665042114. Its totient is φ = 665042112.

The previous prime is 665042083. The next prime is 665042137. The reversal of 665042113 is 311240566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498941569 + 166100544 = 22337^2 + 12888^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665042113 is a prime.

It is not a weakly prime, because it can be changed into another prime (665042143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332521056 + 332521057.

It is an arithmetic number, because the mean of its divisors is an integer number (332521057).

Almost surely, 2^665042113 is an apocalyptic number.

It is an amenable number.

665042113 is a deficient number, since it is larger than the sum of its proper divisors (1).

665042113 is an equidigital number, since it uses as much as digits as its factorization.

665042113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 665042113 is about 25788.4104395754. The cubic root of 665042113 is about 872.8702983983.

Adding to 665042113 its reverse (311240566), we get a palindrome (976282679).

The spelling of 665042113 in words is "six hundred sixty-five million, forty-two thousand, one hundred thirteen".