25552802549 has 4 divisors (see below), whose sum is σ = 25839912780. Its totient is φ = 25265692320.

The previous prime is 25552802533. The next prime is 25552802551. The reversal of 25552802549 is 94520825552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5517815524 + 20034987025 = 74282^2 + 141545^2 .

It is a cyclic number.

It is not a de Polignac number, because 25552802549 - 2⁴ = 25552802533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25552804549) 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 3 ways as a sum of consecutive naturals, for example, 143554982 + ... + 143555159.

It is an arithmetic number, because the mean of its divisors is an integer number (6459978195).

Almost surely, 2^25552802549 is an apocalyptic number.

It is an amenable number.

25552802549 is a deficient number, since it is larger than the sum of its proper divisors (287110231).

25552802549 is an equidigital number, since it uses as much as digits as its factorization.

25552802549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287110230.

The product of its (nonzero) digits is 1440000, while the sum is 47.

The spelling of 25552802549 in words is "twenty-five billion, five hundred fifty-two million, eight hundred two thousand, five hundred forty-nine".