25000000013 has 2 divisors, whose sum is σ = 25000000014. Its totient is φ = 25000000012.

The previous prime is 24999999991. The next prime is 25000000021. The reversal of 25000000013 is 31000000052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23481884644 + 1518115369 = 153238^2 + 38963^2 .

It is a cyclic number.

It is not a de Polignac number, because 25000000013 - 2²⁶ = 24932891149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 24999999940 and 25000000003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25000000513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12500000006 + 12500000007.

It is an arithmetic number, because the mean of its divisors is an integer number (12500000007).

Almost surely, 2^25000000013 is an apocalyptic number.

It is an amenable number.

25000000013 is a deficient number, since it is larger than the sum of its proper divisors (1).

25000000013 is an equidigital number, since it uses as much as digits as its factorization.

25000000013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30, while the sum is 11.

Adding to 25000000013 its reverse (31000000052), we get a palindrome (56000000065).

The spelling of 25000000013 in words is "twenty-five billion, thirteen", and thus it is an aban number and an uban number.