25699128503 has 2 divisors, whose sum is σ = 25699128504. Its totient is φ = 25699128502.

The previous prime is 25699128473. The next prime is 25699128541. The reversal of 25699128503 is 30582199652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25699128503 - 2⁶ = 25699128439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25699125503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12849564251 + 12849564252.

It is an arithmetic number, because the mean of its divisors is an integer number (12849564252).

Almost surely, 2^25699128503 is an apocalyptic number.

25699128503 is a deficient number, since it is larger than the sum of its proper divisors (1).

25699128503 is an equidigital number, since it uses as much as digits as its factorization.

25699128503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 25699128503 in words is "twenty-five billion, six hundred ninety-nine million, one hundred twenty-eight thousand, five hundred three".