1220516666 has 32 divisors (see below), whose sum is σ = 2034160128. Its totient is φ = 546289920.

The previous prime is 1220516641. The next prime is 1220516723. The reversal of 1220516666 is 6666150221.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137231 + ... + 145853.

It is an arithmetic number, because the mean of its divisors is an integer number (63567504).

Almost surely, 2^1220516666 is an apocalyptic number.

1220516666 is a deficient number, since it is larger than the sum of its proper divisors (813643462).

1220516666 is a wasteful number, since it uses less digits than its factorization.

1220516666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8846.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1220516666 is about 34935.8936625357. The cubic root of 1220516666 is about 1068.6805484730.

Adding to 1220516666 its reverse (6666150221), we get a palindrome (7886666887).

The spelling of 1220516666 in words is "one billion, two hundred twenty million, five hundred sixteen thousand, six hundred sixty-six".