256560769 has 2 divisors, whose sum is σ = 256560770. Its totient is φ = 256560768.

The previous prime is 256560761. The next prime is 256560797. The reversal of 256560769 is 967065652.

256560769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200505600 + 56055169 = 14160^2 + 7487^2 .

It is a cyclic number.

It is not a de Polignac number, because 256560769 - 2³ = 256560761 is a prime.

It is a super-2 number, since 2×256560769² = 131646856379742722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256560761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128280384 + 128280385.

It is an arithmetic number, because the mean of its divisors is an integer number (128280385).

Almost surely, 2^256560769 is an apocalyptic number.

It is an amenable number.

256560769 is a deficient number, since it is larger than the sum of its proper divisors (1).

256560769 is an equidigital number, since it uses as much as digits as its factorization.

256560769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 46.

The square root of 256560769 is about 16017.5144451316. The cubic root of 256560769 is about 635.4237104332.

The spelling of 256560769 in words is "two hundred fifty-six million, five hundred sixty thousand, seven hundred sixty-nine".