25306606513 has 2 divisors, whose sum is σ = 25306606514. Its totient is φ = 25306606512.

The previous prime is 25306606499. The next prime is 25306606517. The reversal of 25306606513 is 31560660352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24546115584 + 760490929 = 156672^2 + 27577^2 .

It is a cyclic number.

It is not a de Polignac number, because 25306606513 - 2¹³ = 25306598321 is a prime.

It is not a weakly prime, because it can be changed into another prime (25306606517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12653303256 + 12653303257.

It is an arithmetic number, because the mean of its divisors is an integer number (12653303257).

Almost surely, 2^25306606513 is an apocalyptic number.

It is an amenable number.

25306606513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25306606513 is an equidigital number, since it uses as much as digits as its factorization.

25306606513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 37.

The spelling of 25306606513 in words is "twenty-five billion, three hundred six million, six hundred six thousand, five hundred thirteen".