1201217666 has 16 divisors (see below), whose sum is σ = 1989314208. Its totient is φ = 539428800.

The previous prime is 1201217657. The next prime is 1201217669. The reversal of 1201217666 is 6667121021.

It is a super-2 number, since 2×1201217666² = 2885847762220975112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1201217669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327095 + ... + 330746.

It is an arithmetic number, because the mean of its divisors is an integer number (124332138).

Almost surely, 2^1201217666 is an apocalyptic number.

1201217666 is a deficient number, since it is larger than the sum of its proper divisors (788096542).

1201217666 is a wasteful number, since it uses less digits than its factorization.

1201217666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657937.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 1201217666 is about 34658.5871899014. The cubic root of 1201217666 is about 1063.0178819007.

Adding to 1201217666 its reverse (6667121021), we get a palindrome (7868338687).

The spelling of 1201217666 in words is "one billion, two hundred one million, two hundred seventeen thousand, six hundred sixty-six".