25404128917 has 2 divisors, whose sum is σ = 25404128918. Its totient is φ = 25404128916.

The previous prime is 25404128887. The next prime is 25404128933. The reversal of 25404128917 is 71982140452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16680755716 + 8723373201 = 129154^2 + 93399^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25404128917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25404128947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12702064458 + 12702064459.

It is an arithmetic number, because the mean of its divisors is an integer number (12702064459).

Almost surely, 2^25404128917 is an apocalyptic number.

It is an amenable number.

25404128917 is a deficient number, since it is larger than the sum of its proper divisors (1).

25404128917 is an equidigital number, since it uses as much as digits as its factorization.

25404128917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 25404128917 in words is "twenty-five billion, four hundred four million, one hundred twenty-eight thousand, nine hundred seventeen".