25496670181 has 2 divisors, whose sum is σ = 25496670182. Its totient is φ = 25496670180.

The previous prime is 25496670169. The next prime is 25496670187. The reversal of 25496670181 is 18107669452.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21856961281 + 3639708900 = 147841^2 + 60330^2 .

It is a cyclic number.

It is not a de Polignac number, because 25496670181 - 2⁵ = 25496670149 is a prime.

It is a super-2 number, since 2×25496670181² (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 (25496670187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12748335090 + 12748335091.

It is an arithmetic number, because the mean of its divisors is an integer number (12748335091).

Almost surely, 2^25496670181 is an apocalyptic number.

It is an amenable number.

25496670181 is a deficient number, since it is larger than the sum of its proper divisors (1).

25496670181 is an equidigital number, since it uses as much as digits as its factorization.

25496670181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 25496670181 in words is "twenty-five billion, four hundred ninety-six million, six hundred seventy thousand, one hundred eighty-one".