221666862 has 16 divisors (see below), whose sum is σ = 445289472. Its totient is φ = 73563000.

The previous prime is 221666857. The next prime is 221666873. The reversal of 221666862 is 268666122.

221666862 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221666862.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80014 + ... + 82737.

It is an arithmetic number, because the mean of its divisors is an integer number (27830592).

Almost surely, 2^221666862 is an apocalyptic number.

221666862 is an abundant number, since it is smaller than the sum of its proper divisors (223622610).

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

221666862 is a wasteful number, since it uses less digits than its factorization.

221666862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162983.

The product of its digits is 82944, while the sum is 39.

The square root of 221666862 is about 14888.4808493009. The cubic root of 221666862 is about 605.2018651107.

The spelling of 221666862 in words is "two hundred twenty-one million, six hundred sixty-six thousand, eight hundred sixty-two".