640684832289 has 8 divisors (see below), whose sum is σ = 899206782240. Its totient is φ = 404643051936.

The previous prime is 640684832239. The next prime is 640684832299. The reversal of 640684832289 is 982238486046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640684832289 - 2⁸ = 640684832033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640684832239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5620042332 + ... + 5620042445.

It is an arithmetic number, because the mean of its divisors is an integer number (112400847780).

Almost surely, 2^640684832289 is an apocalyptic number.

It is an amenable number.

640684832289 is a deficient number, since it is larger than the sum of its proper divisors (258521949951).

640684832289 is a wasteful number, since it uses less digits than its factorization.

640684832289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11240084799.

The product of its (nonzero) digits is 31850496, while the sum is 60.

The spelling of 640684832289 in words is "six hundred forty billion, six hundred eighty-four million, eight hundred thirty-two thousand, two hundred eighty-nine".