1213664666 has 8 divisors (see below), whose sum is σ = 1847668800. Its totient is φ = 597775068.

The previous prime is 1213664659. The next prime is 1213664671. The reversal of 1213664666 is 6664663121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4528466 + ... + 4528733.

It is an arithmetic number, because the mean of its divisors is an integer number (230958600).

Almost surely, 2^1213664666 is an apocalyptic number.

1213664666 is a deficient number, since it is larger than the sum of its proper divisors (634004134).

1213664666 is an equidigital number, since it uses as much as digits as its factorization.

1213664666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9057268.

The product of its digits is 186624, while the sum is 41.

The square root of 1213664666 is about 34837.6903080557. The cubic root of 1213664666 is about 1066.6769311295.

The spelling of 1213664666 in words is "one billion, two hundred thirteen million, six hundred sixty-four thousand, six hundred sixty-six".