256680071 has 2 divisors, whose sum is σ = 256680072. Its totient is φ = 256680070.

The previous prime is 256680001. The next prime is 256680097. The reversal of 256680071 is 170086652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256680071 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256680001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128340035 + 128340036.

It is an arithmetic number, because the mean of its divisors is an integer number (128340036).

Almost surely, 2^256680071 is an apocalyptic number.

256680071 is a deficient number, since it is larger than the sum of its proper divisors (1).

256680071 is an equidigital number, since it uses as much as digits as its factorization.

256680071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 256680071 is about 16021.2381231914. The cubic root of 256680071 is about 635.5221868716.

The spelling of 256680071 in words is "two hundred fifty-six million, six hundred eighty thousand, seventy-one".