25745342549 has 2 divisors, whose sum is σ = 25745342550. Its totient is φ = 25745342548.

The previous prime is 25745342477. The next prime is 25745342561. The reversal of 25745342549 is 94524354752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19490114449 + 6255228100 = 139607^2 + 79090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25745342549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25745342497 and 25745342506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25745342569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12872671274 + 12872671275.

It is an arithmetic number, because the mean of its divisors is an integer number (12872671275).

Almost surely, 2^25745342549 is an apocalyptic number.

It is an amenable number.

25745342549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25745342549 is an equidigital number, since it uses as much as digits as its factorization.

25745342549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048000, while the sum is 50.

The spelling of 25745342549 in words is "twenty-five billion, seven hundred forty-five million, three hundred forty-two thousand, five hundred forty-nine".