25185710081 has 32 divisors (see below), whose sum is σ = 29806092288. Its totient is φ = 20835622080.

The previous prime is 25185710063. The next prime is 25185710083. The reversal of 25185710081 is 18001758152.

It is a de Polignac number, because none of the positive numbers 2^k-25185710081 is a prime.

It is a super-2 number, since 2×25185710081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25185710083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16936520 + ... + 16938006.

It is an arithmetic number, because the mean of its divisors is an integer number (931440384).

Almost surely, 2^25185710081 is an apocalyptic number.

It is an amenable number.

25185710081 is a deficient number, since it is larger than the sum of its proper divisors (4620382207).

25185710081 is a wasteful number, since it uses less digits than its factorization.

25185710081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2261.

The product of its (nonzero) digits is 22400, while the sum is 38.

The spelling of 25185710081 in words is "twenty-five billion, one hundred eighty-five million, seven hundred ten thousand, eighty-one".