25554475321 has 2 divisors, whose sum is σ = 25554475322. Its totient is φ = 25554475320.

The previous prime is 25554475319. The next prime is 25554475333. The reversal of 25554475321 is 12357445552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16331562025 + 9222913296 = 127795^2 + 96036^2 .

It is a cyclic number.

It is not a de Polignac number, because 25554475321 - 2¹ = 25554475319 is a prime.

Together with 25554475319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25554475301) 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, 12777237660 + 12777237661.

It is an arithmetic number, because the mean of its divisors is an integer number (12777237661).

Almost surely, 2^25554475321 is an apocalyptic number.

It is an amenable number.

25554475321 is a deficient number, since it is larger than the sum of its proper divisors (1).

25554475321 is an equidigital number, since it uses as much as digits as its factorization.

25554475321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840000, while the sum is 43.

The spelling of 25554475321 in words is "twenty-five billion, five hundred fifty-four million, four hundred seventy-five thousand, three hundred twenty-one".