25566411026 has 8 divisors (see below), whose sum is σ = 41299587084. Its totient is φ = 11799882000.

The previous prime is 25566411023. The next prime is 25566411029. The reversal of 25566411026 is 62011466552.

It is a Cunningham number, because it is equal to 159895²+1.

It is an interprime number because it is at equal distance from previous prime (25566411023) and next prime (25566411029).

It can be written as a sum of positive squares in 2 ways, for example, as 25566411025 + 1 = 159895^2 + 1^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25566411023) 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, 491661725 + ... + 491661776.

Almost surely, 2^25566411026 is an apocalyptic number.

25566411026 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

25566411026 is a deficient number, since it is larger than the sum of its proper divisors (15733176058).

25566411026 is a wasteful number, since it uses less digits than its factorization.

25566411026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983323516.

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 25566411026 its reverse (62011466552), we get a palindrome (87577877578).

The spelling of 25566411026 in words is "twenty-five billion, five hundred sixty-six million, four hundred eleven thousand, twenty-six".