25699128541 has 2 divisors, whose sum is σ = 25699128542. Its totient is φ = 25699128540.

The previous prime is 25699128503. The next prime is 25699128571. The reversal of 25699128541 is 14582199652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14131265625 + 11567862916 = 118875^2 + 107554^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25699128541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25699128571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12849564270 + 12849564271.

It is an arithmetic number, because the mean of its divisors is an integer number (12849564271).

Almost surely, 2^25699128541 is an apocalyptic number.

It is an amenable number.

25699128541 is a deficient number, since it is larger than the sum of its proper divisors (1).

25699128541 is an equidigital number, since it uses as much as digits as its factorization.

25699128541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 52.

The spelling of 25699128541 in words is "twenty-five billion, six hundred ninety-nine million, one hundred twenty-eight thousand, five hundred forty-one".