222081718 has 4 divisors (see below), whose sum is σ = 333122580. Its totient is φ = 111040858.

The previous prime is 222081701. The next prime is 222081731. The reversal of 222081718 is 817180222.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 222081718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55520428 + ... + 55520431.

It is an arithmetic number, because the mean of its divisors is an integer number (83280645).

Almost surely, 2^222081718 is an apocalyptic number.

222081718 is a deficient number, since it is larger than the sum of its proper divisors (111040862).

222081718 is a wasteful number, since it uses less digits than its factorization.

222081718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111040861.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 222081718 is about 14902.4064499664. The cubic root of 222081718 is about 605.5791808057.

It can be divided in two parts, 2220 and 81718, that added together give a palindrome (83938).

The spelling of 222081718 in words is "two hundred twenty-two million, eighty-one thousand, seven hundred eighteen".