640837209599 has 6 divisors (see below), whose sum is σ = 680750946144. Its totient is φ = 603140902880.

The previous prime is 640837209559. The next prime is 640837209611. The reversal of 640837209599 is 995902738046.

It is a happy number.

It is not a de Polignac number, because 640837209599 - 2⁸ = 640837209343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640837209539) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1108714607 + ... + 1108715184.

It is an arithmetic number, because the mean of its divisors is an integer number (113458491024).

Almost surely, 2^640837209599 is an apocalyptic number.

640837209599 is a deficient number, since it is larger than the sum of its proper divisors (39913736545).

640837209599 is a wasteful number, since it uses less digits than its factorization.

640837209599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217429825 (or 2217429808 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 640837209599 in words is "six hundred forty billion, eight hundred thirty-seven million, two hundred nine thousand, five hundred ninety-nine".