646458777852 has 12 divisors (see below), whose sum is σ = 1508403815016. Its totient is φ = 215486259280.

The previous prime is 646458777841. The next prime is 646458777869. The reversal of 646458777852 is 258777854646.

It is a tau number, because it is divible by the number of its divisors (12).

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, 26935782399 + ... + 26935782422.

It is an arithmetic number, because the mean of its divisors is an integer number (125700317918).

Almost surely, 2^646458777852 is an apocalyptic number.

It is an amenable number.

646458777852 is an abundant number, since it is smaller than the sum of its proper divisors (861945037164).

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

646458777852 is a wasteful number, since it uses less digits than its factorization.

646458777852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53871564828 (or 53871564826 counting only the distinct ones).

The product of its digits is 632217600, while the sum is 69.

The spelling of 646458777852 in words is "six hundred forty-six billion, four hundred fifty-eight million, seven hundred seventy-seven thousand, eight hundred fifty-two".