25208727449 has 2 divisors, whose sum is σ = 25208727450. Its totient is φ = 25208727448.

The previous prime is 25208727443. The next prime is 25208727487. The reversal of 25208727449 is 94472780252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21387015049 + 3821712400 = 146243^2 + 61820^2 .

It is a cyclic number.

It is not a de Polignac number, because 25208727449 - 2¹⁶ = 25208661913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25208727397 and 25208727406.

It is not a weakly prime, because it can be changed into another prime (25208727443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12604363724 + 12604363725.

It is an arithmetic number, because the mean of its divisors is an integer number (12604363725).

Almost surely, 2^25208727449 is an apocalyptic number.

It is an amenable number.

25208727449 is a deficient number, since it is larger than the sum of its proper divisors (1).

25208727449 is an equidigital number, since it uses as much as digits as its factorization.

25208727449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 25208727449 in words is "twenty-five billion, two hundred eight million, seven hundred twenty-seven thousand, four hundred forty-nine".