222172866 has 12 divisors (see below), whose sum is σ = 481374582. Its totient is φ = 74057616.

The previous prime is 222172861. The next prime is 222172879. The reversal of 222172866 is 668271222.

222172866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 214769025 + 7403841 = 14655^2 + 2721^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 222172866.

It is not an unprimeable number, because it can be changed into a prime (222172861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6171451 + ... + 6171486.

Almost surely, 2^222172866 is an apocalyptic number.

222172866 is an abundant number, since it is smaller than the sum of its proper divisors (259201716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

222172866 is a wasteful number, since it uses less digits than its factorization.

222172866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12342945 (or 12342942 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 222172866 is about 14905.4643000478. The cubic root of 222172866 is about 605.6620178531.

The spelling of 222172866 in words is "two hundred twenty-two million, one hundred seventy-two thousand, eight hundred sixty-six".