22776544561 has 3 divisors (see below), whose sum is σ = 22776695481. Its totient is φ = 22776393642.

The previous prime is 22776544547. The next prime is 22776544577. The reversal of 22776544561 is 16544567722.

The square root of 22776544561 is 150919.

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 22776544561 - 2¹¹ = 22776542513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22776544591) 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, 75460 + ... + 226378.

It is an arithmetic number, because the mean of its divisors is an integer number (7592231827).

Almost surely, 2^22776544561 is an apocalyptic number.

22776544561 is the 150919-th square number.

22776544561 is the 75460-th centered octagonal number.

It is an amenable number.

22776544561 is a deficient number, since it is larger than the sum of its proper divisors (150920).

22776544561 is an frugal number, since it uses more digits than its factorization.

22776544561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301838 (or 150919 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 49.

Multiplying 22776544561 by its sum of digits (49), we get a square (1116050683489 = 1056433²).

The spelling of 22776544561 in words is "twenty-two billion, seven hundred seventy-six million, five hundred forty-four thousand, five hundred sixty-one".