1171216666 has 16 divisors (see below), whose sum is σ = 1866243456. Its totient is φ = 549360576.

The previous prime is 1171216661. The next prime is 1171216679. The reversal of 1171216666 is 6666121711.

It is not an unprimeable number, because it can be changed into a prime (1171216661) 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, 45666 + ... + 66541.

It is an arithmetic number, because the mean of its divisors is an integer number (116640216).

Almost surely, 2^1171216666 is an apocalyptic number.

1171216666 is a deficient number, since it is larger than the sum of its proper divisors (695026790).

1171216666 is a wasteful number, since it uses less digits than its factorization.

1171216666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112533.

The product of its digits is 18144, while the sum is 37.

The square root of 1171216666 is about 34223.0429097122. The cubic root of 1171216666 is about 1054.0933687257.

The spelling of 1171216666 in words is "one billion, one hundred seventy-one million, two hundred sixteen thousand, six hundred sixty-six".