662916409 has 2 divisors, whose sum is σ = 662916410. Its totient is φ = 662916408.

The previous prime is 662916391. The next prime is 662916433. The reversal of 662916409 is 904619266.

It is a happy number.

662916409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658076409 + 4840000 = 25653^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 662916409 - 2¹¹ = 662914361 is a prime.

It is not a weakly prime, because it can be changed into another prime (662916469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331458204 + 331458205.

It is an arithmetic number, because the mean of its divisors is an integer number (331458205).

Almost surely, 2^662916409 is an apocalyptic number.

It is an amenable number.

662916409 is a deficient number, since it is larger than the sum of its proper divisors (1).

662916409 is an equidigital number, since it uses as much as digits as its factorization.

662916409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 662916409 is about 25747.1631252843. The cubic root of 662916409 is about 871.9393075797.

The spelling of 662916409 in words is "six hundred sixty-two million, nine hundred sixteen thousand, four hundred nine".