25809666797 has 8 divisors (see below), whose sum is σ = 26145767040. Its totient is φ = 25473801600.

The previous prime is 25809666763. The next prime is 25809666847. The reversal of 25809666797 is 79766690852.

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

It is a cyclic number.

It is not a de Polignac number, because 25809666797 - 2⁶ = 25809666733 is a prime.

It is a super-2 number, since 2×25809666797² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25809666097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167933 + ... + 282525.

It is an arithmetic number, because the mean of its divisors is an integer number (3268220880).

Almost surely, 2^25809666797 is an apocalyptic number.

It is an amenable number.

25809666797 is a deficient number, since it is larger than the sum of its proper divisors (336100243).

25809666797 is a wasteful number, since it uses less digits than its factorization.

25809666797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117523.

The product of its (nonzero) digits is 68584320, while the sum is 65.

The spelling of 25809666797 in words is "twenty-five billion, eight hundred nine million, six hundred sixty-six thousand, seven hundred ninety-seven".