1220206166 has 16 divisors (see below), whose sum is σ = 1956473568. Its totient is φ = 569342400.

The previous prime is 1220206139. The next prime is 1220206171. The reversal of 1220206166 is 6616020221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321605 + ... + 325376.

It is an arithmetic number, because the mean of its divisors is an integer number (122279598).

Almost surely, 2^1220206166 is an apocalyptic number.

1220206166 is a deficient number, since it is larger than the sum of its proper divisors (736267402).

1220206166 is a wasteful number, since it uses less digits than its factorization.

1220206166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647047.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1220206166 is about 34931.4495261791. The cubic root of 1220206166 is about 1068.5899165129.

Adding to 1220206166 its reverse (6616020221), we get a palindrome (7836226387).

The spelling of 1220206166 in words is "one billion, two hundred twenty million, two hundred six thousand, one hundred sixty-six".