1972814666 has 8 divisors (see below), whose sum is σ = 2959575840. Its totient is φ = 986289388.

The previous prime is 1972814647. The next prime is 1972814687. The reversal of 1972814666 is 6664182791.

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

It is a Curzon number.

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, 36326 + ... + 72561.

It is an arithmetic number, because the mean of its divisors is an integer number (369946980).

Almost surely, 2^1972814666 is an apocalyptic number.

1972814666 is a deficient number, since it is larger than the sum of its proper divisors (986761174).

1972814666 is a wasteful number, since it uses less digits than its factorization.

1972814666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117948.

The product of its digits is 870912, while the sum is 50.

The square root of 1972814666 is about 44416.3783530355. The cubic root of 1972814666 is about 1254.1864255005.

The spelling of 1972814666 in words is "one billion, nine hundred seventy-two million, eight hundred fourteen thousand, six hundred sixty-six".