25113781513 has 2 divisors, whose sum is σ = 25113781514. Its totient is φ = 25113781512.

The previous prime is 25113781439. The next prime is 25113781531. The reversal of 25113781513 is 31518731152.

Together with next prime (25113781531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12892921209 + 12220860304 = 113547^2 + 110548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25113781513 is a prime.

It is not a weakly prime, because it can be changed into another prime (25113781813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12556890756 + 12556890757.

It is an arithmetic number, because the mean of its divisors is an integer number (12556890757).

Almost surely, 2^25113781513 is an apocalyptic number.

It is an amenable number.

25113781513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25113781513 is an equidigital number, since it uses as much as digits as its factorization.

25113781513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 37.

The spelling of 25113781513 in words is "twenty-five billion, one hundred thirteen million, seven hundred eighty-one thousand, five hundred thirteen".