25519204157 has 2 divisors, whose sum is σ = 25519204158. Its totient is φ = 25519204156.

The previous prime is 25519204141. The next prime is 25519204187. The reversal of 25519204157 is 75140291552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23796456121 + 1722748036 = 154261^2 + 41506^2 .

It is a cyclic number.

It is not a de Polignac number, because 25519204157 - 2⁴ = 25519204141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25519204127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12759602078 + 12759602079.

It is an arithmetic number, because the mean of its divisors is an integer number (12759602079).

Almost surely, 2^25519204157 is an apocalyptic number.

It is an amenable number.

25519204157 is a deficient number, since it is larger than the sum of its proper divisors (1).

25519204157 is an equidigital number, since it uses as much as digits as its factorization.

25519204157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 25519204157 in words is "twenty-five billion, five hundred nineteen million, two hundred four thousand, one hundred fifty-seven".