646601802684 has 24 divisors (see below), whose sum is σ = 1508879490048. Its totient is φ = 215513655600.

The previous prime is 646601802683. The next prime is 646601802701. The reversal of 646601802684 is 486208106646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646601802683) 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, 2401692 + ... + 2657315.

It is an arithmetic number, because the mean of its divisors is an integer number (62869978752).

Almost surely, 2^646601802684 is an apocalyptic number.

It is an amenable number.

646601802684 is an abundant number, since it is smaller than the sum of its proper divisors (862277687364).

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

646601802684 is a wasteful number, since it uses less digits than its factorization.

646601802684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5069665 (or 5069663 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 51.

The spelling of 646601802684 in words is "six hundred forty-six billion, six hundred one million, eight hundred two thousand, six hundred eighty-four".