25502504821 has 2 divisors, whose sum is σ = 25502504822. Its totient is φ = 25502504820.

The previous prime is 25502504761. The next prime is 25502504873. The reversal of 25502504821 is 12840520552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17033904196 + 8468600625 = 130514^2 + 92025^2 .

It is a cyclic number.

It is not a de Polignac number, because 25502504821 - 2¹⁵ = 25502472053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25502504891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12751252410 + 12751252411.

It is an arithmetic number, because the mean of its divisors is an integer number (12751252411).

Almost surely, 2^25502504821 is an apocalyptic number.

It is an amenable number.

25502504821 is a deficient number, since it is larger than the sum of its proper divisors (1).

25502504821 is an equidigital number, since it uses as much as digits as its factorization.

25502504821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32000, while the sum is 34.

The spelling of 25502504821 in words is "twenty-five billion, five hundred two million, five hundred four thousand, eight hundred twenty-one".