25185009121 has 2 divisors, whose sum is σ = 25185009122. Its totient is φ = 25185009120.

The previous prime is 25185009107. The next prime is 25185009191. The reversal of 25185009121 is 12190058152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21363914896 + 3821094225 = 146164^2 + 61815^2 .

It is a cyclic number.

It is not a de Polignac number, because 25185009121 - 2⁵ = 25185009089 is a prime.

It is not a weakly prime, because it can be changed into another prime (25185009191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12592504560 + 12592504561.

It is an arithmetic number, because the mean of its divisors is an integer number (12592504561).

Almost surely, 2^25185009121 is an apocalyptic number.

It is an amenable number.

25185009121 is a deficient number, since it is larger than the sum of its proper divisors (1).

25185009121 is an equidigital number, since it uses as much as digits as its factorization.

25185009121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 34.

The spelling of 25185009121 in words is "twenty-five billion, one hundred eighty-five million, nine thousand, one hundred twenty-one".