25221250034549 has 2 divisors, whose sum is σ = 25221250034550. Its totient is φ = 25221250034548.

The previous prime is 25221250034509. The next prime is 25221250034551. The reversal of 25221250034549 is 94543005212252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22581437472049 + 2639812562500 = 4751993^2 + 1624750^2 .

It is a cyclic number.

It is not a de Polignac number, because 25221250034549 - 2¹² = 25221250030453 is a prime.

It is a super-2 number, since 2×25221250034549² (a number of 28 digits) contains 22 as substring.

Together with 25221250034551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25221250034509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12610625017274 + 12610625017275.

It is an arithmetic number, because the mean of its divisors is an integer number (12610625017275).

Almost surely, 2^{25221250034549} is an apocalyptic number.

It is an amenable number.

25221250034549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25221250034549 is an equidigital number, since it uses as much as digits as its factorization.

25221250034549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 25221250034549 in words is "twenty-five trillion, two hundred twenty-one billion, two hundred fifty million, thirty-four thousand, five hundred forty-nine".