25516216106 has 8 divisors (see below), whose sum is σ = 38282324004. Its totient is φ = 12755441440.

The previous prime is 25516216093. The next prime is 25516216127. The reversal of 25516216106 is 60161261552.

It can be written as a sum of positive squares in 2 ways, for example, as 22218585481 + 3297630625 = 149059^2 + 57425^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1321325 + ... + 1340496.

Almost surely, 2^25516216106 is an apocalyptic number.

25516216106 is a deficient number, since it is larger than the sum of its proper divisors (12766107898).

25516216106 is a wasteful number, since it uses less digits than its factorization.

25516216106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666616.

The product of its (nonzero) digits is 21600, while the sum is 35.

Adding to 25516216106 its reverse (60161261552), we get a palindrome (85677477658).

The spelling of 25516216106 in words is "twenty-five billion, five hundred sixteen million, two hundred sixteen thousand, one hundred six".