640302653 has 2 divisors, whose sum is σ = 640302654. Its totient is φ = 640302652.

The previous prime is 640302643. The next prime is 640302673. The reversal of 640302653 is 356203046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 352050169 + 288252484 = 18763^2 + 16978^2 .

It is a cyclic number.

It is not a de Polignac number, because 640302653 - 2²⁴ = 623525437 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640302643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320151326 + 320151327.

It is an arithmetic number, because the mean of its divisors is an integer number (320151327).

Almost surely, 2^640302653 is an apocalyptic number.

It is an amenable number.

640302653 is a deficient number, since it is larger than the sum of its proper divisors (1).

640302653 is an equidigital number, since it uses as much as digits as its factorization.

640302653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 640302653 is about 25304.2022794634. The cubic root of 640302653 is about 861.9096975473.

Adding to 640302653 its reverse (356203046), we get a palindrome (996505699).

The spelling of 640302653 in words is "six hundred forty million, three hundred two thousand, six hundred fifty-three".