1973816666 has 8 divisors (see below), whose sum is σ = 2964378144. Its totient is φ = 985690620.

The previous prime is 1973816657. The next prime is 1973816683. The reversal of 1973816666 is 6666183791.

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, 606830 + ... + 610073.

It is an arithmetic number, because the mean of its divisors is an integer number (370547268).

Almost surely, 2^1973816666 is an apocalyptic number.

1973816666 is a deficient number, since it is larger than the sum of its proper divisors (990561478).

1973816666 is a wasteful number, since it uses less digits than its factorization.

1973816666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217716.

The product of its digits is 1959552, while the sum is 53.

The square root of 1973816666 is about 44427.6565440942. The cubic root of 1973816666 is about 1254.3987248986.

The spelling of 1973816666 in words is "one billion, nine hundred seventy-three million, eight hundred sixteen thousand, six hundred sixty-six".