25443245549 has 2 divisors, whose sum is σ = 25443245550. Its totient is φ = 25443245548.

The previous prime is 25443245543. The next prime is 25443245579. The reversal of 25443245549 is 94554234452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18253901449 + 7189344100 = 135107^2 + 84790^2 .

It is a cyclic number.

It is not a de Polignac number, because 25443245549 - 2⁴ = 25443245533 is a prime.

It is a super-2 number, since 2×25443245549² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25443245543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12721622774 + 12721622775.

It is an arithmetic number, because the mean of its divisors is an integer number (12721622775).

Almost surely, 2^25443245549 is an apocalyptic number.

It is an amenable number.

25443245549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25443245549 is an equidigital number, since it uses as much as digits as its factorization.

25443245549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456000, while the sum is 47.

The spelling of 25443245549 in words is "twenty-five billion, four hundred forty-three million, two hundred forty-five thousand, five hundred forty-nine".