25709437613 has 2 divisors, whose sum is σ = 25709437614. Its totient is φ = 25709437612.

The previous prime is 25709437543. The next prime is 25709437687. The reversal of 25709437613 is 31673490752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25594240324 + 115197289 = 159982^2 + 10733^2 .

It is a cyclic number.

It is not a de Polignac number, because 25709437613 - 2¹⁶ = 25709372077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25709433613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12854718806 + 12854718807.

It is an arithmetic number, because the mean of its divisors is an integer number (12854718807).

Almost surely, 2^25709437613 is an apocalyptic number.

It is an amenable number.

25709437613 is a deficient number, since it is larger than the sum of its proper divisors (1).

25709437613 is an equidigital number, since it uses as much as digits as its factorization.

25709437613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 47.

The spelling of 25709437613 in words is "twenty-five billion, seven hundred nine million, four hundred thirty-seven thousand, six hundred thirteen".