665445827 has 2 divisors, whose sum is σ = 665445828. Its totient is φ = 665445826.

The previous prime is 665445811. The next prime is 665445829. The reversal of 665445827 is 728544566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665445827 - 2⁴ = 665445811 is a prime.

Together with 665445829, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665445829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332722913 + 332722914.

It is an arithmetic number, because the mean of its divisors is an integer number (332722914).

Almost surely, 2^665445827 is an apocalyptic number.

665445827 is a deficient number, since it is larger than the sum of its proper divisors (1).

665445827 is an equidigital number, since it uses as much as digits as its factorization.

665445827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 47.

The square root of 665445827 is about 25796.2366828962. The cubic root of 665445827 is about 873.0468880562.

The spelling of 665445827 in words is "six hundred sixty-five million, four hundred forty-five thousand, eight hundred twenty-seven".