662642009 has 2 divisors, whose sum is σ = 662642010. Its totient is φ = 662642008.

The previous prime is 662642003. The next prime is 662642021. The reversal of 662642009 is 900246266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347934409 + 314707600 = 18653^2 + 17740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-662642009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 662642009.

It is not a weakly prime, because it can be changed into another prime (662642003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331321004 + 331321005.

It is an arithmetic number, because the mean of its divisors is an integer number (331321005).

Almost surely, 2^662642009 is an apocalyptic number.

It is an amenable number.

662642009 is a deficient number, since it is larger than the sum of its proper divisors (1).

662642009 is an equidigital number, since it uses as much as digits as its factorization.

662642009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 662642009 is about 25741.8338313338. The cubic root of 662642009 is about 871.8189841309.

The spelling of 662642009 in words is "six hundred sixty-two million, six hundred forty-two thousand, nine".