25127921898181 has 2 divisors, whose sum is σ = 25127921898182. Its totient is φ = 25127921898180.

The previous prime is 25127921898179. The next prime is 25127921898257. The reversal of 25127921898181 is 18189812972152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17094999852100 + 8032922046081 = 4134610^2 + 2834241^2 .

It is a cyclic number.

It is not a de Polignac number, because 25127921898181 - 2¹ = 25127921898179 is a prime.

It is a super-2 number, since 2×25127921898181² (a number of 28 digits) contains 22 as substring.

Together with 25127921898179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25127921898151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12563960949090 + 12563960949091.

It is an arithmetic number, because the mean of its divisors is an integer number (12563960949091).

Almost surely, 2^{25127921898181} is an apocalyptic number.

It is an amenable number.

25127921898181 is a deficient number, since it is larger than the sum of its proper divisors (1).

25127921898181 is an equidigital number, since it uses as much as digits as its factorization.

25127921898181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11612160, while the sum is 64.

The spelling of 25127921898181 in words is "twenty-five trillion, one hundred twenty-seven billion, nine hundred twenty-one million, eight hundred ninety-eight thousand, one hundred eighty-one".