640684808486046 has 48 divisors (see below), whose sum is σ = 1426826137184448. Its totient is φ = 207620869896000.

The previous prime is 640684808486039. The next prime is 640684808486143.

It is a happy number.

640684808486046 is a `hidden beast` number, since 6 + 4 + 0 + 6 + 8 + 4 + 8 + 0 + 8 + 4 + 8 + 604 + 6 = 666.

640684808486046 is nontrivially palindromic in base 10.

640684808486046 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×640684808486046² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 389915005 + ... + 391554696.

It is an arithmetic number, because the mean of its divisors is an integer number (29725544524676).

Almost surely, 2^{640684808486046} is an apocalyptic number.

640684808486046 is an abundant number, since it is smaller than the sum of its proper divisors (786141328698402).

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

640684808486046 is a wasteful number, since it uses less digits than its factorization.

640684808486046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781470977 (or 781470974 counting only the distinct ones).

The product of its (nonzero) digits is 1358954496, while the sum is 72.

The spelling of 640684808486046 in words is "six hundred forty trillion, six hundred eighty-four billion, eight hundred eight million, four hundred eighty-six thousand, forty-six".