665107231 has 2 divisors, whose sum is σ = 665107232. Its totient is φ = 665107230.

The previous prime is 665107181. The next prime is 665107249. The reversal of 665107231 is 132701566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665107231 - 2¹¹ = 665105183 is a prime.

It is a super-2 number, since 2×665107231² = 884735257456974722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 665107193 and 665107202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665107831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332553615 + 332553616.

It is an arithmetic number, because the mean of its divisors is an integer number (332553616).

Almost surely, 2^665107231 is an apocalyptic number.

665107231 is a deficient number, since it is larger than the sum of its proper divisors (1).

665107231 is an equidigital number, since it uses as much as digits as its factorization.

665107231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 665107231 is about 25789.6729525599. The cubic root of 665107231 is about 872.8987866759.

Adding to 665107231 its reverse (132701566), we get a palindrome (797808797).

The spelling of 665107231 in words is "six hundred sixty-five million, one hundred seven thousand, two hundred thirty-one".