256511032513 has 2 divisors, whose sum is σ = 256511032514. Its totient is φ = 256511032512.

The previous prime is 256511032457. The next prime is 256511032529. The reversal of 256511032513 is 315230115652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221282745649 + 35228286864 = 470407^2 + 187692^2 .

It is a cyclic number.

It is not a de Polignac number, because 256511032513 - 2³⁷ = 119072079041 is a prime.

It is not a weakly prime, because it can be changed into another prime (256511062513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128255516256 + 128255516257.

It is an arithmetic number, because the mean of its divisors is an integer number (128255516257).

Almost surely, 2^256511032513 is an apocalyptic number.

It is an amenable number.

256511032513 is a deficient number, since it is larger than the sum of its proper divisors (1).

256511032513 is an equidigital number, since it uses as much as digits as its factorization.

256511032513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 34.

The spelling of 256511032513 in words is "two hundred fifty-six billion, five hundred eleven million, thirty-two thousand, five hundred thirteen".