25510262958221 has 2 divisors, whose sum is σ = 25510262958222. Its totient is φ = 25510262958220.

The previous prime is 25510262958203. The next prime is 25510262958263. The reversal of 25510262958221 is 12285926201552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22657504800100 + 2852758158121 = 4759990^2 + 1689011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25510262958221 is a prime.

It is a super-3 number, since 3×25510262958221³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25510262958221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25510262958721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12755131479110 + 12755131479111.

It is an arithmetic number, because the mean of its divisors is an integer number (12755131479111).

Almost surely, 2^{25510262958221} is an apocalyptic number.

It is an amenable number.

25510262958221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25510262958221 is an equidigital number, since it uses as much as digits as its factorization.

25510262958221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728000, while the sum is 50.

The spelling of 25510262958221 in words is "twenty-five trillion, five hundred ten billion, two hundred sixty-two million, nine hundred fifty-eight thousand, two hundred twenty-one".