640658069682 has 8 divisors (see below), whose sum is σ = 1281316139376. Its totient is φ = 213552689892.

The previous prime is 640658069551. The next prime is 640658069707. The reversal of 640658069682 is 286960856046.

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

640658069682 is an admirable number.

It is a super-3 number, since 3×640658069682³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53388172468 + ... + 53388172479.

It is an arithmetic number, because the mean of its divisors is an integer number (160164517422).

Almost surely, 2^640658069682 is an apocalyptic number.

640658069682 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640658069682 is a wasteful number, since it uses less digits than its factorization.

640658069682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106776344952.

The product of its (nonzero) digits is 29859840, while the sum is 60.

The spelling of 640658069682 in words is "six hundred forty billion, six hundred fifty-eight million, sixty-nine thousand, six hundred eighty-two".