646215512646 has 16 divisors (see below), whose sum is σ = 1409924755008. Its totient is φ = 195822882600.

The previous prime is 646215512639. The next prime is 646215512713.

It is a happy number.

646215512646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646215512595 and 646215512604.

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 7 ways as a sum of consecutive naturals, for example, 4895572000 + ... + 4895572131.

It is an arithmetic number, because the mean of its divisors is an integer number (88120297188).

Almost surely, 2^646215512646 is an apocalyptic number.

646215512646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

646215512646 is an abundant number, since it is smaller than the sum of its proper divisors (763709242362).

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

646215512646 is a wasteful number, since it uses less digits than its factorization.

646215512646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9791144147.

The product of its digits is 2073600, while the sum is 48.

The spelling of 646215512646 in words is "six hundred forty-six billion, two hundred fifteen million, five hundred twelve thousand, six hundred forty-six".