25456126181 has 2 divisors, whose sum is σ = 25456126182. Its totient is φ = 25456126180.

The previous prime is 25456126081. The next prime is 25456126183. The reversal of 25456126181 is 18162165452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14973437956 + 10482688225 = 122366^2 + 102385^2 .

It is a cyclic number.

It is not a de Polignac number, because 25456126181 - 2¹⁴ = 25456109797 is a prime.

It is a super-2 number, since 2×25456126181² (a number of 22 digits) contains 22 as substring.

Together with 25456126183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25456126183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12728063090 + 12728063091.

It is an arithmetic number, because the mean of its divisors is an integer number (12728063091).

Almost surely, 2^25456126181 is an apocalyptic number.

It is an amenable number.

25456126181 is a deficient number, since it is larger than the sum of its proper divisors (1).

25456126181 is an equidigital number, since it uses as much as digits as its factorization.

25456126181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 41.

The spelling of 25456126181 in words is "twenty-five billion, four hundred fifty-six million, one hundred twenty-six thousand, one hundred eighty-one".