256606697 has 2 divisors, whose sum is σ = 256606698. Its totient is φ = 256606696.

The previous prime is 256606673. The next prime is 256606711. The reversal of 256606697 is 796606652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233142361 + 23464336 = 15269^2 + 4844^2 .

It is a cyclic number.

It is not a de Polignac number, because 256606697 - 2⁶ = 256606633 is a prime.

It is not a weakly prime, because it can be changed into another prime (256606627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128303348 + 128303349.

It is an arithmetic number, because the mean of its divisors is an integer number (128303349).

Almost surely, 2^256606697 is an apocalyptic number.

It is an amenable number.

256606697 is a deficient number, since it is larger than the sum of its proper divisors (1).

256606697 is an equidigital number, since it uses as much as digits as its factorization.

256606697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 47.

The square root of 256606697 is about 16018.9480615926. The cubic root of 256606697 is about 635.4616247761.

The spelling of 256606697 in words is "two hundred fifty-six million, six hundred six thousand, six hundred ninety-seven".