25638818605 has 8 divisors (see below), whose sum is σ = 30771757152. Its totient is φ = 20507605008.

The previous prime is 25638818581. The next prime is 25638818609. The reversal of 25638818605 is 50681883652.

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 25638818605 - 2²⁵ = 25605264173 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 (25638818609) 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, 398307 + ... + 458176.

It is an arithmetic number, because the mean of its divisors is an integer number (3846469644).

Almost surely, 2^25638818605 is an apocalyptic number.

It is an amenable number.

25638818605 is a deficient number, since it is larger than the sum of its proper divisors (5132938547).

25638818605 is an equidigital number, since it uses as much as digits as its factorization.

25638818605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862475.

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 25638818605 in words is "twenty-five billion, six hundred thirty-eight million, eight hundred eighteen thousand, six hundred five".