25525549187 has 2 divisors, whose sum is σ = 25525549188. Its totient is φ = 25525549186.

The previous prime is 25525549139. The next prime is 25525549199. The reversal of 25525549187 is 78194552552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25525549187 - 2²⁸ = 25257113731 is a prime.

It is a super-2 number, since 2×25525549187² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25525549117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12762774593 + 12762774594.

It is an arithmetic number, because the mean of its divisors is an integer number (12762774594).

Almost surely, 2^25525549187 is an apocalyptic number.

25525549187 is a deficient number, since it is larger than the sum of its proper divisors (1).

25525549187 is an equidigital number, since it uses as much as digits as its factorization.

25525549187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040000, while the sum is 53.

The spelling of 25525549187 in words is "twenty-five billion, five hundred twenty-five million, five hundred forty-nine thousand, one hundred eighty-seven".