1220081166 has 24 divisors (see below), whose sum is σ = 2647213920. Its totient is φ = 406123776.

The previous prime is 1220081141. The next prime is 1220081201. The reversal of 1220081166 is 6611800221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34195 + ... + 60078.

It is an arithmetic number, because the mean of its divisors is an integer number (110300580).

Almost surely, 2^1220081166 is an apocalyptic number.

1220081166 is an abundant number, since it is smaller than the sum of its proper divisors (1427132754).

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

1220081166 is a wasteful number, since it uses less digits than its factorization.

1220081166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95000 (or 94997 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1220081166 is about 34929.6602617317. The cubic root of 1220081166 is about 1068.5534258759.

Adding to 1220081166 its reverse (6611800221), we get a palindrome (7831881387).

The spelling of 1220081166 in words is "one billion, two hundred twenty million, eighty-one thousand, one hundred sixty-six".