25305555505249 has 12 divisors (see below), whose sum is σ = 25570985825484. Its totient is φ = 25040919056384.

The previous prime is 25305555505159. The next prime is 25305555505259. The reversal of 25305555505249 is 94250555550352.

It can be written as a sum of positive squares in 6 ways, for example, as 21129283155600 + 4176272349649 = 4596660^2 + 2043593^2 .

It is not a de Polignac number, because 25305555505249 - 2⁹ = 25305555504737 is a prime.

It is a super-2 number, since 2×25305555505249² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25305555505249.

It is not an unprimeable number, because it can be changed into a prime (25305555505259) 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 in 11 ways as a sum of consecutive naturals, for example, 42723729 + ... + 43311985.

It is an arithmetic number, because the mean of its divisors is an integer number (2130915485457).

Almost surely, 2^{25305555505249} is an apocalyptic number.

It is an amenable number.

25305555505249 is a deficient number, since it is larger than the sum of its proper divisors (265430320235).

25305555505249 is an frugal number, since it uses more digits than its factorization.

25305555505249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589604 (or 588987 counting only the distinct ones).

The product of its (nonzero) digits is 33750000, while the sum is 55.

The spelling of 25305555505249 in words is "twenty-five trillion, three hundred five billion, five hundred fifty-five million, five hundred five thousand, two hundred forty-nine".