646259489892 has 36 divisors (see below), whose sum is σ = 1633987047420. Its totient is φ = 215368840512.

The previous prime is 646259489891. The next prime is 646259489917. The reversal of 646259489892 is 298984952646.

646259489892 is a `hidden beast` number, since 6 + 4 + 6 + 2 + 59 + 489 + 8 + 92 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 500278948416 + 145980541476 = 707304^2 + 382074^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 646259489892.

It is not an unprimeable number, because it can be changed into a prime (646259489891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1970203 + ... + 2274690.

It is an arithmetic number, because the mean of its divisors is an integer number (45388529095).

Almost surely, 2^646259489892 is an apocalyptic number.

It is an amenable number.

646259489892 is an abundant number, since it is smaller than the sum of its proper divisors (987727557528).

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

646259489892 is a wasteful number, since it uses less digits than its factorization.

646259489892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4249132 (or 4249127 counting only the distinct ones).

The product of its digits is 537477120, while the sum is 72.

The spelling of 646259489892 in words is "six hundred forty-six billion, two hundred fifty-nine million, four hundred eighty-nine thousand, eight hundred ninety-two".