25751081681 has 16 divisors (see below), whose sum is σ = 29000326656. Its totient is φ = 22687511616.

The previous prime is 25751081669. The next prime is 25751081689. The reversal of 25751081681 is 18618015752.

It is a cyclic number.

It is not a de Polignac number, because 25751081681 - 2⁶ = 25751081617 is a prime.

It is a super-3 number, since 3×25751081681³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25751081689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45431 + ... + 231443.

It is an arithmetic number, because the mean of its divisors is an integer number (1812520416).

Almost surely, 2^25751081681 is an apocalyptic number.

It is an amenable number.

25751081681 is a deficient number, since it is larger than the sum of its proper divisors (3249244975).

25751081681 is a wasteful number, since it uses less digits than its factorization.

25751081681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186512.

The product of its (nonzero) digits is 134400, while the sum is 44.

The spelling of 25751081681 in words is "twenty-five billion, seven hundred fifty-one million, eighty-one thousand, six hundred eighty-one".