25361526181 has 2 divisors, whose sum is σ = 25361526182. Its totient is φ = 25361526180.

The previous prime is 25361526121. The next prime is 25361526193. The reversal of 25361526181 is 18162516352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25079789956 + 281736225 = 158366^2 + 16785^2 .

It is a cyclic number.

It is not a de Polignac number, because 25361526181 - 2⁹ = 25361525669 is a prime.

It is a super-2 number, since 2×25361526181² (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 (25361526121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12680763090 + 12680763091.

It is an arithmetic number, because the mean of its divisors is an integer number (12680763091).

Almost surely, 2^25361526181 is an apocalyptic number.

It is an amenable number.

25361526181 is a deficient number, since it is larger than the sum of its proper divisors (1).

25361526181 is an equidigital number, since it uses as much as digits as its factorization.

25361526181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 40.

The spelling of 25361526181 in words is "twenty-five billion, three hundred sixty-one million, five hundred twenty-six thousand, one hundred eighty-one".