256724640304305 has 32 divisors (see below), whose sum is σ = 434922617493504. Its totient is φ = 128865442861056.

The previous prime is 256724640304243. The next prime is 256724640304343. The reversal of 256724640304305 is 503403046427652.

It is not a de Polignac number, because 256724640304305 - 2⁸ = 256724640304049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224773104 + ... + 225912366.

It is an arithmetic number, because the mean of its divisors is an integer number (13591331796672).

Almost surely, 2^{256724640304305} is an apocalyptic number.

It is an amenable number.

256724640304305 is a deficient number, since it is larger than the sum of its proper divisors (178197977189199).

256724640304305 is a wasteful number, since it uses less digits than its factorization.

256724640304305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022985.

The product of its (nonzero) digits is 14515200, while the sum is 51.

The spelling of 256724640304305 in words is "two hundred fifty-six trillion, seven hundred twenty-four billion, six hundred forty million, three hundred four thousand, three hundred five".