660607111 has 2 divisors, whose sum is σ = 660607112. Its totient is φ = 660607110.

The previous prime is 660607109. The next prime is 660607133. The reversal of 660607111 is 111706066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660607111 - 2¹ = 660607109 is a prime.

Together with 660607109, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660607111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660607141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330303555 + 330303556.

It is an arithmetic number, because the mean of its divisors is an integer number (330303556).

Almost surely, 2^660607111 is an apocalyptic number.

660607111 is a deficient number, since it is larger than the sum of its proper divisors (1).

660607111 is an equidigital number, since it uses as much as digits as its factorization.

660607111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 660607111 is about 25702.2783231370. The cubic root of 660607111 is about 870.9256501894.

The spelling of 660607111 in words is "six hundred sixty million, six hundred seven thousand, one hundred eleven".