665010623 has 2 divisors, whose sum is σ = 665010624. Its totient is φ = 665010622.

The previous prime is 665010617. The next prime is 665010677. The reversal of 665010623 is 326010566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665010623 - 2¹⁸ = 664748479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665010613) 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, 332505311 + 332505312.

It is an arithmetic number, because the mean of its divisors is an integer number (332505312).

Almost surely, 2^665010623 is an apocalyptic number.

665010623 is a deficient number, since it is larger than the sum of its proper divisors (1).

665010623 is an equidigital number, since it uses as much as digits as its factorization.

665010623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 665010623 is about 25787.7998867682. The cubic root of 665010623 is about 872.8565212660.

The spelling of 665010623 in words is "six hundred sixty-five million, ten thousand, six hundred twenty-three".