22561616508649 has 3 divisors (see below), whose sum is σ = 22561621258557. Its totient is φ = 22561611758742.

The previous prime is 22561616508643. The next prime is 22561616508701. The reversal of 22561616508649 is 94680561616522.

It is a happy number.

The square root of 22561616508649 is 4749907.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 22561616508649 - 2⁵ = 22561616508617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22561616508643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2374954 + ... + 7124860.

It is an arithmetic number, because the mean of its divisors is an integer number (7520540419519).

Almost surely, 2^{22561616508649} is an apocalyptic number.

22561616508649 is the 4749907-th square number.

22561616508649 is the 2374954-th centered octagonal number.

It is an amenable number.

22561616508649 is a deficient number, since it is larger than the sum of its proper divisors (4749908).

22561616508649 is an frugal number, since it uses more digits than its factorization.

22561616508649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9499814 (or 4749907 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 22561616508649 in words is "twenty-two trillion, five hundred sixty-one billion, six hundred sixteen million, five hundred eight thousand, six hundred forty-nine".