662647409 has 2 divisors, whose sum is σ = 662647410. Its totient is φ = 662647408.

The previous prime is 662647397. The next prime is 662647423. The reversal of 662647409 is 904746266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385258384 + 277389025 = 19628^2 + 16655^2 .

It is a cyclic number.

It is not a de Polignac number, because 662647409 - 2¹² = 662643313 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 662647409.

It is not a weakly prime, because it can be changed into another prime (662647429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331323704 + 331323705.

It is an arithmetic number, because the mean of its divisors is an integer number (331323705).

Almost surely, 2^662647409 is an apocalyptic number.

It is an amenable number.

662647409 is a deficient number, since it is larger than the sum of its proper divisors (1).

662647409 is an equidigital number, since it uses as much as digits as its factorization.

662647409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 662647409 is about 25741.9387187523. The cubic root of 662647409 is about 871.8213523325.

The spelling of 662647409 in words is "six hundred sixty-two million, six hundred forty-seven thousand, four hundred nine".