25103312513 has 2 divisors, whose sum is σ = 25103312514. Its totient is φ = 25103312512.

The previous prime is 25103312503. The next prime is 25103312539. The reversal of 25103312513 is 31521330152.

It is an a-pointer prime, because the next prime (25103312539) can be obtained adding 25103312513 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20492495104 + 4610817409 = 143152^2 + 67903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25103312513 is a prime.

It is not a weakly prime, because it can be changed into another prime (25103312503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12551656256 + 12551656257.

It is an arithmetic number, because the mean of its divisors is an integer number (12551656257).

Almost surely, 2^25103312513 is an apocalyptic number.

It is an amenable number.

25103312513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25103312513 is an equidigital number, since it uses as much as digits as its factorization.

25103312513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 25103312513 its reverse (31521330152), we get a palindrome (56624642665).

The spelling of 25103312513 in words is "twenty-five billion, one hundred three million, three hundred twelve thousand, five hundred thirteen".