640786687046 has 8 divisors (see below), whose sum is σ = 1048560033384. Its totient is φ = 291266675920.

The previous prime is 640786687003. The next prime is 640786687069.

640786687046 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×640786687046² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640786687046.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 14563333775 + ... + 14563333818.

It is an arithmetic number, because the mean of its divisors is an integer number (131070004173).

Almost surely, 2^640786687046 is an apocalyptic number.

640786687046 is a deficient number, since it is larger than the sum of its proper divisors (407773346338).

640786687046 is a wasteful number, since it uses less digits than its factorization.

640786687046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29126667606.

The product of its (nonzero) digits is 65028096, while the sum is 62.

The spelling of 640786687046 in words is "six hundred forty billion, seven hundred eighty-six million, six hundred eighty-seven thousand, forty-six".