22781586445 has 4 divisors (see below), whose sum is σ = 27337903740. Its totient is φ = 18225269152.

The previous prime is 22781586433. The next prime is 22781586449. The reversal of 22781586445 is 54468518722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8305405956 + 14476180489 = 91134^2 + 120317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22781586445 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22781586392 and 22781586401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22781586449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2278158640 + ... + 2278158649.

It is an arithmetic number, because the mean of its divisors is an integer number (6834475935).

Almost surely, 2^22781586445 is an apocalyptic number.

It is an amenable number.

22781586445 is a deficient number, since it is larger than the sum of its proper divisors (4556317295).

22781586445 is an equidigital number, since it uses as much as digits as its factorization.

22781586445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4556317294.

The product of its digits is 4300800, while the sum is 52.

The spelling of 22781586445 in words is "twenty-two billion, seven hundred eighty-one million, five hundred eighty-six thousand, four hundred forty-five".