256609594069 has 2 divisors, whose sum is σ = 256609594070. Its totient is φ = 256609594068.

The previous prime is 256609594063. The next prime is 256609594091. The reversal of 256609594069 is 960495906652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254202514225 + 2407079844 = 504185^2 + 49062^2 .

It is a cyclic number.

It is not a de Polignac number, because 256609594069 - 2³ = 256609594061 is a prime.

It is a super-2 number, since 2×256609594069² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256609593998 and 256609594016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256609594061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128304797034 + 128304797035.

It is an arithmetic number, because the mean of its divisors is an integer number (128304797035).

Almost surely, 2^256609594069 is an apocalyptic number.

It is an amenable number.

256609594069 is a deficient number, since it is larger than the sum of its proper divisors (1).

256609594069 is an equidigital number, since it uses as much as digits as its factorization.

256609594069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31492800, while the sum is 61.

The spelling of 256609594069 in words is "two hundred fifty-six billion, six hundred nine million, five hundred ninety-four thousand, sixty-nine".