26561216562 has 8 divisors (see below), whose sum is σ = 53122433136. Its totient is φ = 8853738852.

The previous prime is 26561216503. The next prime is 26561216639.

It is a happy number.

26561216562 is nontrivially palindromic in base 10.

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

26561216562 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2213434708 + ... + 2213434719.

It is an arithmetic number, because the mean of its divisors is an integer number (6640304142).

Almost surely, 2^26561216562 is an apocalyptic number.

26561216562 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26561216562 is a wasteful number, since it uses less digits than its factorization.

26561216562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426869432.

The product of its digits is 259200, while the sum is 42.

The spelling of 26561216562 in words is "twenty-six billion, five hundred sixty-one million, two hundred sixteen thousand, five hundred sixty-two".