25553242321 has 2 divisors, whose sum is σ = 25553242322. Its totient is φ = 25553242320.

The previous prime is 25553242313. The next prime is 25553242339. The reversal of 25553242321 is 12324235552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24336000000 + 1217242321 = 156000^2 + 34889^2 .

It is a cyclic number.

It is not a de Polignac number, because 25553242321 - 2³ = 25553242313 is a prime.

It is not a weakly prime, because it can be changed into another prime (25553242301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12776621160 + 12776621161.

It is an arithmetic number, because the mean of its divisors is an integer number (12776621161).

Almost surely, 2^25553242321 is an apocalyptic number.

It is an amenable number.

25553242321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25553242321 is an equidigital number, since it uses as much as digits as its factorization.

25553242321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72000, while the sum is 34.

Adding to 25553242321 its reverse (12324235552), we get a palindrome (37877477873).

The spelling of 25553242321 in words is "twenty-five billion, five hundred fifty-three million, two hundred forty-two thousand, three hundred twenty-one".