25506821522 has 162 divisors, whose sum is σ = 51906356253. Its totient is φ = 9366948864.

The previous prime is 25506821503. The next prime is 25506821537. The reversal of 25506821522 is 22512860552.

It is a happy number.

It can be written as a sum of positive squares in 14 ways, for example, as 19018321 + 25487803201 = 4361^2 + 159649^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=112931.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 349408478 + ... + 349408550.

Almost surely, 2^25506821522 is an apocalyptic number.

25506821522 is an abundant number, since it is smaller than the sum of its proper divisors (26399534731).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25506821522 is a wasteful number, since it uses less digits than its factorization.

25506821522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 38.

The spelling of 25506821522 in words is "twenty-five billion, five hundred six million, eight hundred twenty-one thousand, five hundred twenty-two".