256245368305 has 8 divisors (see below), whose sum is σ = 307500441192. Its totient is φ = 204992295168.

The previous prime is 256245368263. The next prime is 256245368321. The reversal of 256245368305 is 503863542652.

It can be written as a sum of positive squares in 4 ways, for example, as 4855441761 + 251389926544 = 69681^2 + 501388^2 .

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 256245368305 - 2¹¹ = 256245366257 is a prime.

It is a Duffinian 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, 201874 + ... + 743803.

It is an arithmetic number, because the mean of its divisors is an integer number (38437555149).

Almost surely, 2^256245368305 is an apocalyptic number.

It is an amenable number.

256245368305 is a deficient number, since it is larger than the sum of its proper divisors (51255072887).

256245368305 is an equidigital number, since it uses as much as digits as its factorization.

256245368305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999875.

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 256245368305 in words is "two hundred fifty-six billion, two hundred forty-five million, three hundred sixty-eight thousand, three hundred five".