10256815609 has 2 divisors, whose sum is σ = 10256815610. Its totient is φ = 10256815608.

The previous prime is 10256815607. The next prime is 10256815631. The reversal of 10256815609 is 90651865201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7894855609 + 2361960000 = 88853^2 + 48600^2 .

It is a cyclic number.

It is not a de Polignac number, because 10256815609 - 2¹ = 10256815607 is a prime.

Together with 10256815607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (10256815607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5128407804 + 5128407805.

It is an arithmetic number, because the mean of its divisors is an integer number (5128407805).

Almost surely, 2^10256815609 is an apocalyptic number.

It is an amenable number.

10256815609 is a deficient number, since it is larger than the sum of its proper divisors (1).

10256815609 is an equidigital number, since it uses as much as digits as its factorization.

10256815609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 10256815609 in words is "ten billion, two hundred fifty-six million, eight hundred fifteen thousand, six hundred nine".