25521012413 has 4 divisors (see below), whose sum is σ = 27484167228. Its totient is φ = 23557857600.

The previous prime is 25521012343. The next prime is 25521012421. The reversal of 25521012413 is 31421012552.

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 13412650969 + 12108361444 = 115813^2 + 110038^2 .

It is a cyclic number.

It is not a de Polignac number, because 25521012413 - 2⁸ = 25521012157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25521012113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981577388 + ... + 981577413.

It is an arithmetic number, because the mean of its divisors is an integer number (6871041807).

Almost surely, 2^25521012413 is an apocalyptic number.

It is an amenable number.

25521012413 is a deficient number, since it is larger than the sum of its proper divisors (1963154815).

25521012413 is a wasteful number, since it uses less digits than its factorization.

25521012413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963154814.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 25521012413 its reverse (31421012552), we get a palindrome (56942024965).

The spelling of 25521012413 in words is "twenty-five billion, five hundred twenty-one million, twelve thousand, four hundred thirteen".