665318011 has 2 divisors, whose sum is σ = 665318012. Its totient is φ = 665318010.

The previous prime is 665318009. The next prime is 665318023. The reversal of 665318011 is 110813566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665318011 - 2¹ = 665318009 is a prime.

It is a super-2 number, since 2×665318011² = 885296111521992242, which contains 22 as substring.

Together with 665318009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (665318081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332659005 + 332659006.

It is an arithmetic number, because the mean of its divisors is an integer number (332659006).

Almost surely, 2^665318011 is an apocalyptic number.

665318011 is a deficient number, since it is larger than the sum of its proper divisors (1).

665318011 is an equidigital number, since it uses as much as digits as its factorization.

665318011 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 31.

The square root of 665318011 is about 25793.7591482901. The cubic root of 665318011 is about 872.9909874344.

The spelling of 665318011 in words is "six hundred sixty-five million, three hundred eighteen thousand, eleven".