25901117321 has 2 divisors, whose sum is σ = 25901117322. Its totient is φ = 25901117320.

The previous prime is 25901117309. The next prime is 25901117323. The reversal of 25901117321 is 12371110952.

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., 18256063225 + 7645054096 = 135115^2 + 87436^2 .

It is a cyclic number.

It is not a de Polignac number, because 25901117321 - 2⁶ = 25901117257 is a prime.

Together with 25901117323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25901117323) 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, 12950558660 + 12950558661.

It is an arithmetic number, because the mean of its divisors is an integer number (12950558661).

Almost surely, 2^25901117321 is an apocalyptic number.

It is an amenable number.

25901117321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25901117321 is an equidigital number, since it uses as much as digits as its factorization.

25901117321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 32.

The spelling of 25901117321 in words is "twenty-five billion, nine hundred one million, one hundred seventeen thousand, three hundred twenty-one".