646589383985646 has 48 divisors (see below), whose sum is σ = 1401984307211904. Its totient is φ = 215369739894672.

The previous prime is 646589383985543. The next prime is 646589383985647.

646589383985646 is a `hidden beast` number, since 6 + 4 + 6 + 5 + 8 + 9 + 3 + 8 + 39 + 8 + 564 + 6 = 666.

646589383985646 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646589383985647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174912465 + ... + 178570851.

It is an arithmetic number, because the mean of its divisors is an integer number (29208006400248).

Almost surely, 2^{646589383985646} is an apocalyptic number.

646589383985646 is an abundant number, since it is smaller than the sum of its proper divisors (755394923226258).

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

646589383985646 is a wasteful number, since it uses less digits than its factorization.

646589383985646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665685 (or 3665682 counting only the distinct ones).

The product of its digits is 193491763200, while the sum is 90.

The spelling of 646589383985646 in words is "six hundred forty-six trillion, five hundred eighty-nine billion, three hundred eighty-three million, nine hundred eighty-five thousand, six hundred forty-six".