25668525797 has 4 divisors (see below), whose sum is σ = 25668851340. Its totient is φ = 25668200256.

The previous prime is 25668525739. The next prime is 25668525821. The reversal of 25668525797 is 79752586652.

It is a Cunningham number, because it is equal to 160214²+1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14652134116 + 11016391681 = 121046^2 + 104959^2 .

It is a cyclic number.

It is not a de Polignac number, because 25668525797 - 2¹⁰ = 25668524773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25668525497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38279 + ... + 229787.

It is an arithmetic number, because the mean of its divisors is an integer number (6417212835).

Almost surely, 2^25668525797 is an apocalyptic number.

It is an amenable number.

25668525797 is a deficient number, since it is larger than the sum of its proper divisors (325543).

25668525797 is a wasteful number, since it uses less digits than its factorization.

25668525797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325542.

The product of its digits is 63504000, while the sum is 62.

The spelling of 25668525797 in words is "twenty-five billion, six hundred sixty-eight million, five hundred twenty-five thousand, seven hundred ninety-seven".