256646388246 has 32 divisors (see below), whose sum is σ = 526736498400. Its totient is φ = 83315512320.

The previous prime is 256646388233. The next prime is 256646388259. The reversal of 256646388246 is 642883646652.

It is an interprime number because it is at equal distance from previous prime (256646388233) and next prime (256646388259).

It is a self number, because there is not a number n which added to its sum of digits gives 256646388246.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 776791 + ... + 1056738.

It is an arithmetic number, because the mean of its divisors is an integer number (16460515575).

Almost surely, 2^256646388246 is an apocalyptic number.

256646388246 is an abundant number, since it is smaller than the sum of its proper divisors (270090110154).

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

256646388246 is a wasteful number, since it uses less digits than its factorization.

256646388246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1834144.

The product of its digits is 79626240, while the sum is 60.

The spelling of 256646388246 in words is "two hundred fifty-six billion, six hundred forty-six million, three hundred eighty-eight thousand, two hundred forty-six".