256516007243 has 2 divisors, whose sum is σ = 256516007244. Its totient is φ = 256516007242.

The previous prime is 256516007201. The next prime is 256516007299. The reversal of 256516007243 is 342700615652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256516007243 is a prime.

It is a super-2 number, since 2×256516007243² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256516007243.

It is not a weakly prime, because it can be changed into another prime (256516003243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128258003621 + 128258003622.

It is an arithmetic number, because the mean of its divisors is an integer number (128258003622).

Almost surely, 2^256516007243 is an apocalyptic number.

256516007243 is a deficient number, since it is larger than the sum of its proper divisors (1).

256516007243 is an equidigital number, since it uses as much as digits as its factorization.

256516007243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 256516007243 in words is "two hundred fifty-six billion, five hundred sixteen million, seven thousand, two hundred forty-three".