256220545305 has 8 divisors (see below), whose sum is σ = 409952872512. Its totient is φ = 136650957488.

The previous prime is 256220545279. The next prime is 256220545327. The reversal of 256220545305 is 503545022652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256220545305 - 2⁶ = 256220545241 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8540684829 + ... + 8540684858.

It is an arithmetic number, because the mean of its divisors is an integer number (51244109064).

Almost surely, 2^256220545305 is an apocalyptic number.

It is an amenable number.

256220545305 is a deficient number, since it is larger than the sum of its proper divisors (153732327207).

256220545305 is a wasteful number, since it uses less digits than its factorization.

256220545305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17081369695.

The product of its (nonzero) digits is 360000, while the sum is 39.

Adding to 256220545305 its reverse (503545022652), we get a palindrome (759765567957).

The spelling of 256220545305 in words is "two hundred fifty-six billion, two hundred twenty million, five hundred forty-five thousand, three hundred five".