256521362620 has 12 divisors (see below), whose sum is σ = 538694861544. Its totient is φ = 102608545040.

The previous prime is 256521362609. The next prime is 256521362627. The reversal of 256521362620 is 26263125652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256521362627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6413034046 + ... + 6413034085.

It is an arithmetic number, because the mean of its divisors is an integer number (44891238462).

Almost surely, 2^256521362620 is an apocalyptic number.

256521362620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256521362620 is an abundant number, since it is smaller than the sum of its proper divisors (282173498924).

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

256521362620 is a wasteful number, since it uses less digits than its factorization.

256521362620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12826068140 (or 12826068138 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 256521362620 in words is "two hundred fifty-six billion, five hundred twenty-one million, three hundred sixty-two thousand, six hundred twenty".