25204135542251 has 4 divisors (see below), whose sum is σ = 25209912336792. Its totient is φ = 25198358747712.

The previous prime is 25204135542227. The next prime is 25204135542259. The reversal of 25204135542251 is 15224553140252.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25204135542251 is a prime.

It is a super-2 number, since 2×25204135542251² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25204135542199 and 25204135542208.

It is not an unprimeable number, because it can be changed into a prime (25204135542259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2888390726 + ... + 2888399451.

It is an arithmetic number, because the mean of its divisors is an integer number (6302478084198).

Almost surely, 2^{25204135542251} is an apocalyptic number.

25204135542251 is a deficient number, since it is larger than the sum of its proper divisors (5776794541).

25204135542251 is an equidigital number, since it uses as much as digits as its factorization.

25204135542251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5776794540.

The product of its (nonzero) digits is 480000, while the sum is 41.

The spelling of 25204135542251 in words is "twenty-five trillion, two hundred four billion, one hundred thirty-five million, five hundred forty-two thousand, two hundred fifty-one".