256657726755250 has 16 divisors (see below), whose sum is σ = 480463264486296. Its totient is φ = 102663090702000.

The previous prime is 256657726755217. The next prime is 256657726755253. The reversal of 256657726755250 is 52557627756652.

It is a happy number.

256657726755250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 19333441914361 + 237324284840889 = 4396981^2 + 15405333^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256657726755250.

It is not an unprimeable number, because it can be changed into a prime (256657726755253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513315453261 + ... + 513315453760.

Almost surely, 2^{256657726755250} is an apocalyptic number.

256657726755250 is a deficient number, since it is larger than the sum of its proper divisors (223805537731046).

256657726755250 is a wasteful number, since it uses less digits than its factorization.

256657726755250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026630907038 (or 1026630907028 counting only the distinct ones).

The product of its (nonzero) digits is 1852200000, while the sum is 70.

The spelling of 256657726755250 in words is "two hundred fifty-six trillion, six hundred fifty-seven billion, seven hundred twenty-six million, seven hundred fifty-five thousand, two hundred fifty".