661222 has 4 divisors (see below), whose sum is σ = 991836. Its totient is φ = 330610.

The previous prime is 661217. The next prime is 661231. The reversal of 661222 is 222166.

661222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 661222.

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, 165304 + ... + 165307.

It is an arithmetic number, because the mean of its divisors is an integer number (247959).

2⁶⁶¹²²² is an apocalyptic number.

661222 is a deficient number, since it is larger than the sum of its proper divisors (330614).

661222 is a wasteful number, since it uses less digits than its factorization.

661222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330613.

The product of its digits is 288, while the sum is 19.

The square root of 661222 is about 813.1555816693. The cubic root of 661222 is about 87.1195783791.

Adding to 661222 its reverse (222166), we get a palindrome (883388).

The spelling of 661222 in words is "six hundred sixty-one thousand, two hundred twenty-two".