256124533640 has 16 divisors (see below), whose sum is σ = 576280200780. Its totient is φ = 102449813440.

The previous prime is 256124533631. The next prime is 256124533649. The reversal of 256124533640 is 46335421652.

256124533640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256124533631) and next prime (256124533649).

It can be written as a sum of positive squares in 2 ways, for example, as 234529055524 + 21595478116 = 484282^2 + 146954^2 .

It is not an unprimeable number, because it can be changed into a prime (256124533649) by changing a digit.

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, 3201556631 + ... + 3201556710.

Almost surely, 2^256124533640 is an apocalyptic number.

256124533640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256124533640 is an abundant number, since it is smaller than the sum of its proper divisors (320155667140).

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

256124533640 is a wasteful number, since it uses less digits than its factorization.

256124533640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6403113352 (or 6403113348 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 41.

The spelling of 256124533640 in words is "two hundred fifty-six billion, one hundred twenty-four million, five hundred thirty-three thousand, six hundred forty".