25561057202 has 6 divisors (see below), whose sum is σ = 38341924959. Its totient is φ = 12780415550.

The previous prime is 25561057187. The next prime is 25561057259. The reversal of 25561057202 is 20275016552.

It can be written as a sum of positive squares in only one way, i.e., 12780528601 + 12780528601 = 113051^2 + 113051^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=113051.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 169577 + ... + 282627.

Almost surely, 2^25561057202 is an apocalyptic number.

25561057202 is a deficient number, since it is larger than the sum of its proper divisors (12780867757).

25561057202 is an frugal number, since it uses more digits than its factorization.

25561057202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226104 (or 113053 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The spelling of 25561057202 in words is "twenty-five billion, five hundred sixty-one million, fifty-seven thousand, two hundred two".