25424104431521 has 2 divisors, whose sum is σ = 25424104431522. Its totient is φ = 25424104431520.

The previous prime is 25424104431497. The next prime is 25424104431611. The reversal of 25424104431521 is 12513440142452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24845190405025 + 578914026496 = 4984495^2 + 760864^2 .

It is a cyclic number.

It is not a de Polignac number, because 25424104431521 - 2²⁶ = 25424037322657 is a prime.

It is a super-2 number, since 2×25424104431521² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25424104430521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12712052215760 + 12712052215761.

It is an arithmetic number, because the mean of its divisors is an integer number (12712052215761).

Almost surely, 2^{25424104431521} is an apocalyptic number.

It is an amenable number.

25424104431521 is a deficient number, since it is larger than the sum of its proper divisors (1).

25424104431521 is an equidigital number, since it uses as much as digits as its factorization.

25424104431521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 153600, while the sum is 38.

Adding to 25424104431521 its reverse (12513440142452), we get a palindrome (37937544573973).

The spelling of 25424104431521 in words is "twenty-five trillion, four hundred twenty-four billion, one hundred four million, four hundred thirty-one thousand, five hundred twenty-one".