1220401166 has 16 divisors (see below), whose sum is σ = 1855747584. Its totient is φ = 601874784.

The previous prime is 1220401163. The next prime is 1220401199. The reversal of 1220401166 is 6611040221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220401163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30056 + ... + 57828.

It is an arithmetic number, because the mean of its divisors is an integer number (115984224).

Almost surely, 2^1220401166 is an apocalyptic number.

1220401166 is a deficient number, since it is larger than the sum of its proper divisors (635346418).

1220401166 is a wasteful number, since it uses less digits than its factorization.

1220401166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28075.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1220401166 is about 34934.2405957250. The cubic root of 1220401166 is about 1068.6468369308.

Adding to 1220401166 its reverse (6611040221), we get a palindrome (7831441387).

The spelling of 1220401166 in words is "one billion, two hundred twenty million, four hundred one thousand, one hundred sixty-six".