640837209559 has 2 divisors, whose sum is σ = 640837209560. Its totient is φ = 640837209558.

The previous prime is 640837209541. The next prime is 640837209611. The reversal of 640837209559 is 955902738046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 640837209559 - 2⁵ = 640837209527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640837209539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320418604779 + 320418604780.

It is an arithmetic number, because the mean of its divisors is an integer number (320418604780).

Almost surely, 2^640837209559 is an apocalyptic number.

640837209559 is a deficient number, since it is larger than the sum of its proper divisors (1).

640837209559 is an equidigital number, since it uses as much as digits as its factorization.

640837209559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16329600, while the sum is 58.

The spelling of 640837209559 in words is "six hundred forty billion, eight hundred thirty-seven million, two hundred nine thousand, five hundred fifty-nine".