25471881681 has 8 divisors (see below), whose sum is σ = 33963567840. Its totient is φ = 16980724992.

The previous prime is 25471881647. The next prime is 25471881727. The reversal of 25471881681 is 18618817452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25471881681 - 2¹³ = 25471873489 is a prime.

It is a super-2 number, since 2×25471881681² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25471881641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1680 + ... + 225713.

It is an arithmetic number, because the mean of its divisors is an integer number (4245445980).

Almost surely, 2^25471881681 is an apocalyptic number.

It is an amenable number.

25471881681 is a deficient number, since it is larger than the sum of its proper divisors (8491686159).

25471881681 is a wasteful number, since it uses less digits than its factorization.

25471881681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264735.

The product of its digits is 860160, while the sum is 51.

The spelling of 25471881681 in words is "twenty-five billion, four hundred seventy-one million, eight hundred eighty-one thousand, six hundred eighty-one".