22661689444 has 9 divisors (see below), whose sum is σ = 39658483417. Its totient is φ = 11330694184.

The previous prime is 22661689439. The next prime is 22661689459. The reversal of 22661689444 is 44498616622.

It is a happy number.

The square root of 22661689444 is 150538.

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

It can be written as a sum of positive squares in only one way, i.e., 9892689444 + 12769000000 = 99462^2 + 113000^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22661689391 and 22661689400.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 263442 + ... + 338710.

Almost surely, 2^22661689444 is an apocalyptic number.

22661689444 is the 150538-th square number.

It is an amenable number.

22661689444 is a deficient number, since it is larger than the sum of its proper divisors (16996793973).

22661689444 is an frugal number, since it uses more digits than its factorization.

22661689444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150542 (or 75271 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 52.

The spelling of 22661689444 in words is "twenty-two billion, six hundred sixty-one million, six hundred eighty-nine thousand, four hundred forty-four".