256684166911 has 2 divisors, whose sum is σ = 256684166912. Its totient is φ = 256684166910.

The previous prime is 256684166881. The next prime is 256684166939. The reversal of 256684166911 is 119661486652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256684166911 - 2⁹ = 256684166399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256684166951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128342083455 + 128342083456.

It is an arithmetic number, because the mean of its divisors is an integer number (128342083456).

Almost surely, 2^256684166911 is an apocalyptic number.

256684166911 is a deficient number, since it is larger than the sum of its proper divisors (1).

256684166911 is an equidigital number, since it uses as much as digits as its factorization.

256684166911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 55.

The spelling of 256684166911 in words is "two hundred fifty-six billion, six hundred eighty-four million, one hundred sixty-six thousand, nine hundred eleven".