256573292009 has 2 divisors, whose sum is σ = 256573292010. Its totient is φ = 256573292008.

The previous prime is 256573291999. The next prime is 256573292023. The reversal of 256573292009 is 900292375652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143443987600 + 113129304409 = 378740^2 + 336347^2 .

It is a cyclic number.

It is not a de Polignac number, because 256573292009 - 2⁴ = 256573291993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (256573294009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128286646004 + 128286646005.

It is an arithmetic number, because the mean of its divisors is an integer number (128286646005).

Almost surely, 2^256573292009 is an apocalyptic number.

It is an amenable number.

256573292009 is a deficient number, since it is larger than the sum of its proper divisors (1).

256573292009 is an equidigital number, since it uses as much as digits as its factorization.

256573292009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 256573292009 in words is "two hundred fifty-six billion, five hundred seventy-three million, two hundred ninety-two thousand, nine".