222221777779 has 4 divisors (see below), whose sum is σ = 233917660840. Its totient is φ = 210525894720.

The previous prime is 222221777749. The next prime is 222221777783. The reversal of 222221777779 is 977777122222.

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

It is a cyclic number.

It is not a de Polignac number, because 222221777779 - 2¹⁹ = 222221253491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222221777749) 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, 5847941502 + ... + 5847941539.

It is an arithmetic number, because the mean of its divisors is an integer number (58479415210).

Almost surely, 2^222221777779 is an apocalyptic number.

222221777779 is a deficient number, since it is larger than the sum of its proper divisors (11695883061).

222221777779 is a wasteful number, since it uses less digits than its factorization.

222221777779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11695883060.

The product of its digits is 4840416, while the sum is 55.

It can be divided in two parts, 222221 and 777779, that added together give a 6-th power (1000000 = 10⁶).

The spelling of 222221777779 in words is "two hundred twenty-two billion, two hundred twenty-one million, seven hundred seventy-seven thousand, seven hundred seventy-nine".