25638818606 has 4 divisors (see below), whose sum is σ = 38458227912. Its totient is φ = 12819409302.

The previous prime is 25638818581. The next prime is 25638818609. The reversal of 25638818606 is 60681883652.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×25638818606² (a number of 22 digits) contains 22 as substring.

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 as a sum of consecutive naturals, namely, 6409704650 + ... + 6409704653.

It is an arithmetic number, because the mean of its divisors is an integer number (9614556978).

Almost surely, 2^25638818606 is an apocalyptic number.

25638818606 is a deficient number, since it is larger than the sum of its proper divisors (12819409306).

25638818606 is a wasteful number, since it uses less digits than its factorization.

25638818606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12819409305.

The product of its (nonzero) digits is 3317760, while the sum is 53.

The spelling of 25638818606 in words is "twenty-five billion, six hundred thirty-eight million, eight hundred eighteen thousand, six hundred six".