25756497681 has 8 divisors (see below), whose sum is σ = 34491962880. Its totient is φ = 17096015472.

The previous prime is 25756497677. The next prime is 25756497707. The reversal of 25756497681 is 18679465752.

It is a happy number.

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

It is not a de Polignac number, because 25756497681 - 2² = 25756497677 is a prime.

It is a super-2 number, since 2×25756497681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25756497601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18744945 + ... + 18746318.

It is an arithmetic number, because the mean of its divisors is an integer number (4311495360).

Almost surely, 2^25756497681 is an apocalyptic number.

It is an amenable number.

25756497681 is a deficient number, since it is larger than the sum of its proper divisors (8735465199).

25756497681 is a wasteful number, since it uses less digits than its factorization.

25756497681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37491495.

The product of its digits is 25401600, while the sum is 60.

The spelling of 25756497681 in words is "twenty-five billion, seven hundred fifty-six million, four hundred ninety-seven thousand, six hundred eighty-one".