640541353 has 2 divisors, whose sum is σ = 640541354. Its totient is φ = 640541352.

The previous prime is 640541327. The next prime is 640541381. The reversal of 640541353 is 353145046.

640541353 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., 325549849 + 314991504 = 18043^2 + 17748^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640541353 is a prime.

It is not a weakly prime, because it can be changed into another prime (640541303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320270676 + 320270677.

It is an arithmetic number, because the mean of its divisors is an integer number (320270677).

Almost surely, 2^640541353 is an apocalyptic number.

It is an amenable number.

640541353 is a deficient number, since it is larger than the sum of its proper divisors (1).

640541353 is an equidigital number, since it uses as much as digits as its factorization.

640541353 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 640541353 is about 25308.9184478515. The cubic root of 640541353 is about 862.0167887192.

Adding to 640541353 its reverse (353145046), we get a palindrome (993686399).

The spelling of 640541353 in words is "six hundred forty million, five hundred forty-one thousand, three hundred fifty-three".