25538119709 has 2 divisors, whose sum is σ = 25538119710. Its totient is φ = 25538119708.

The previous prime is 25538119643. The next prime is 25538119769. The reversal of 25538119709 is 90791183552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23373823225 + 2164296484 = 152885^2 + 46522^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25538119709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25538119769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12769059854 + 12769059855.

It is an arithmetic number, because the mean of its divisors is an integer number (12769059855).

Almost surely, 2^25538119709 is an apocalyptic number.

It is an amenable number.

25538119709 is a deficient number, since it is larger than the sum of its proper divisors (1).

25538119709 is an equidigital number, since it uses as much as digits as its factorization.

25538119709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 50.

The spelling of 25538119709 in words is "twenty-five billion, five hundred thirty-eight million, one hundred nineteen thousand, seven hundred nine".