22222227777781 has 4 divisors (see below), whose sum is σ = 22229637660000. Its totient is φ = 22214817895564.

The previous prime is 22222227777779. The next prime is 22222227777803. The reversal of 22222227777781 is 18777772222222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22222227777781 - 2¹ = 22222227777779 is a prime.

It is a super-2 number, since 2×22222227777781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222227777721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3704936611 + ... + 3704942608.

It is an arithmetic number, because the mean of its divisors is an integer number (5557409415000).

Almost surely, 2^{22222227777781} is an apocalyptic number.

It is an amenable number.

22222227777781 is a deficient number, since it is larger than the sum of its proper divisors (7409882219).

22222227777781 is an equidigital number, since it uses as much as digits as its factorization.

22222227777781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7409882218.

The product of its digits is 17210368, while the sum is 58.

The spelling of 22222227777781 in words is "twenty-two trillion, two hundred twenty-two billion, two hundred twenty-seven million, seven hundred seventy-seven thousand, seven hundred eighty-one".